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Reducing antibiotic prescribing and addressing the global problem of antibiotic resistance by targeted hygiene in the home and everyday life settings: A Position Paper

Identifieur interne : 000862 ( Pmc/Corpus ); précédent : 000861; suivant : 000863

Reducing antibiotic prescribing and addressing the global problem of antibiotic resistance by targeted hygiene in the home and everyday life settings: A Position Paper

Auteurs : Jean-Yves Maillard ; Sally F. Bloomfield ; Patrice Courvalin ; Sabiha Y. Essack ; Sumanth Gandra ; Charles P. Gerba ; Joseph R. Rubino ; Elizabeth A. Scott

Source :

RBID : PMC:7165117

Abstract

Highlights

Global and national AMR action plans focus on infection prevention in healthcare settings

Evidence demonstrates home and everyday life settings are important for infection transmission, acquisition and spread of antibiotic resistant pathogenic and commensal strains

Studies show targeted hygiene helps to maximize protection against colonization and infections, thereby reducing antibiotic prescribing and minimizing selection pressure for AMR development across the world, including low-and middle-income countries

Reducing AMR requires greater consideration of the role of hygiene in preventing infections in the home and community


Url:
DOI: 10.1016/j.ajic.2020.04.011
PubMed: 32311380
PubMed Central: 7165117

Links to Exploration step

PMC:7165117

Le document en format XML

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<pmc article-type="review-article">
<pmc-dir>properties open_access</pmc-dir>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">Am J Infect Control</journal-id>
<journal-id journal-id-type="iso-abbrev">Am J Infect Control</journal-id>
<journal-title-group>
<journal-title>American Journal of Infection Control</journal-title>
</journal-title-group>
<issn pub-type="ppub">0196-6553</issn>
<issn pub-type="epub">1527-3296</issn>
<publisher>
<publisher-name>Published by Elsevier Inc. on behalf of Association for Professionals in Infection Control and Epidemiology, Inc.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">32311380</article-id>
<article-id pub-id-type="pmc">7165117</article-id>
<article-id pub-id-type="publisher-id">S0196-6553(20)30209-1</article-id>
<article-id pub-id-type="doi">10.1016/j.ajic.2020.04.011</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Article</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>Reducing antibiotic prescribing and addressing the global problem of antibiotic resistance by targeted hygiene in the home and everyday life settings: A Position Paper</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" id="au0001">
<name>
<surname>Maillard</surname>
<given-names>Jean-Yves</given-names>
</name>
<degrees>BSc, PhD</degrees>
<email>maillardj@cardiff.ac.uk</email>
<xref rid="aff0001" ref-type="aff">a</xref>
<xref rid="aff0002" ref-type="aff">b</xref>
<xref rid="cor0001" ref-type="corresp"></xref>
</contrib>
<contrib contrib-type="author" id="au0002">
<name>
<surname>Bloomfield</surname>
<given-names>Sally F.</given-names>
</name>
<degrees>PhD, BPharm</degrees>
<xref rid="aff0003" ref-type="aff">c</xref>
</contrib>
<contrib contrib-type="author" id="au0003">
<name>
<surname>Courvalin</surname>
<given-names>Patrice</given-names>
</name>
<degrees>MD</degrees>
<xref rid="aff0004" ref-type="aff">d</xref>
</contrib>
<contrib contrib-type="author" id="au0004">
<name>
<surname>Essack</surname>
<given-names>Sabiha Y.</given-names>
</name>
<degrees>PhD, BPharm, MPharm</degrees>
<xref rid="aff0005" ref-type="aff">e</xref>
</contrib>
<contrib contrib-type="author" id="au0005">
<name>
<surname>Gandra</surname>
<given-names>Sumanth</given-names>
</name>
<degrees>MD, MPH</degrees>
<xref rid="aff0006" ref-type="aff">f</xref>
</contrib>
<contrib contrib-type="author" id="au0006">
<name>
<surname>Gerba</surname>
<given-names>Charles P.</given-names>
</name>
<degrees>PhD</degrees>
<xref rid="aff0007" ref-type="aff">g</xref>
</contrib>
<contrib contrib-type="author" id="au0007">
<name>
<surname>Rubino</surname>
<given-names>Joseph R.</given-names>
</name>
<xref rid="aff0008" ref-type="aff">h</xref>
</contrib>
<contrib contrib-type="author" id="au0008">
<name>
<surname>Scott</surname>
<given-names>Elizabeth A.</given-names>
</name>
<degrees>PhD, MPhil</degrees>
<xref rid="aff0009" ref-type="aff">i</xref>
</contrib>
</contrib-group>
<aff id="aff0001">
<label>a</label>
Cardiff School of Pharmacy and Pharmaceutical Sciences, Cardiff University, Cardiff, UK</aff>
<aff id="aff0002">
<label>b</label>
International Scientific Forum on Home Hygiene, Somerset, UK</aff>
<aff id="aff0003">
<label>c</label>
London School of Hygiene and Tropical Medicine, London, UK</aff>
<aff id="aff0004">
<label>d</label>
Department of Microbiology, Institut Pasteur, Paris, France</aff>
<aff id="aff0005">
<label>e</label>
Antimicrobial Research Unit, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa</aff>
<aff id="aff0006">
<label>f</label>
Division of Infectious Diseases, Department of Medicine, Washington University School of Medicine, St. Louis, MO, USA</aff>
<aff id="aff0007">
<label>g</label>
Departments of Soil, Water and Environmental Science and Environmental Health, University of Arizona, Tucson, AZ, USA</aff>
<aff id="aff0008">
<label>h</label>
Research & Development, Home Hygiene, Lysol/Harpic, Reckitt Benckiser LLC., One Philips Parkway, Montvale, NJ, USA</aff>
<aff id="aff0009">
<label>i</label>
College of Natural, Behavioral and Health Sciences, Simmons University, Boston, MA, USA</aff>
<author-notes>
<corresp id="cor0001">
<label></label>
Corresponding author: Jean-Yves Maillard BSc, PhD, Cardiff School of Pharmacy and Pharmaceutical Sciences, Cardiff University, Redwood Building, King Edward VII avenue, Cardiff, CF10 3NB UK. Business tel: +44 (0)292 0879088.
<email>maillardj@cardiff.ac.uk</email>
</corresp>
</author-notes>
<pub-date pub-type="pmc-release">
<day>18</day>
<month>4</month>
<year>2020</year>
</pub-date>
<pmc-comment> PMC Release delay is 0 months and 0 days and was based on .</pmc-comment>
<pub-date pub-type="epub">
<day>18</day>
<month>4</month>
<year>2020</year>
</pub-date>
<permissions>
<copyright-statement>© 2020 Published by Elsevier Inc. on behalf of Association for Professionals in Infection Control and Epidemiology, Inc.</copyright-statement>
<copyright-year>2020</copyright-year>
<copyright-holder></copyright-holder>
<license>
<license-p>Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.</license-p>
</license>
</permissions>
<abstract abstract-type="author-highlights" id="abs0001">
<title>Highlights</title>
<p>
<list list-type="simple" id="celist0001">
<list-item id="celistitem0001">
<label></label>
<p id="para0006">Global and national AMR action plans focus on infection prevention in healthcare settings</p>
</list-item>
<list-item id="celistitem0002">
<label></label>
<p id="para0007">Evidence demonstrates home and everyday life settings are important for infection transmission, acquisition and spread of antibiotic resistant pathogenic and commensal strains</p>
</list-item>
<list-item id="celistitem0003">
<label></label>
<p id="para0008">Studies show targeted hygiene helps to maximize protection against colonization and infections, thereby reducing antibiotic prescribing and minimizing selection pressure for AMR development across the world, including low-and middle-income countries</p>
</list-item>
<list-item id="celistitem0004">
<label></label>
<p id="para0009">Reducing AMR requires greater consideration of the role of hygiene in preventing infections in the home and community</p>
</list-item>
</list>
</p>
</abstract>
<abstract id="abs0002">
<p>Antimicrobial resistance (AMR) continues to threaten global health. Although global and national AMR action plans are in place, infection prevention and control is primarily discussed in the context of healthcare facilities with home and everyday life settings barely addressed.</p>
<p>As seen with the recent global SARS-CoV-2 pandemic, everyday hygiene measures can play an important role in containing the threat from infectious microorganisms.</p>
<p>This position paper has been developed following a meeting of global experts in London, 2019. It presents evidence that home and community settings are important for infection transmission and also the acquisition and spread of AMR. It also demonstrates that the targeted hygiene approach offers a framework for maximizing protection against colonization and infections, thereby reducing antibiotic prescribing and minimizing selection pressure for the development of antibiotic resistance. If combined with the provision of clean water and sanitation, targeted hygiene can reduce the circulation of resistant bacteria in homes and communities, regardless of a country's Human Development Index (overall social and economic development). Achieving a reduction of AMR strains in healthcare settings requires a mirrored reduction in the community.</p>
<p>The authors call upon national and international policy makers, health agencies and healthcare professionals to further recognize the importance of targeted hygiene in the home and everyday life settings for preventing and controlling infection, in a unified quest to tackle AMR.</p>
</abstract>
</article-meta>
</front>
<body>
<sec id="sec0001">
<title>INTRODUCTION</title>
<p id="para0010">Antimicrobial resistance (AMR) is one of the greatest threats to global health today.
<xref rid="bib0001" ref-type="bibr">
<sup>1</sup>
</xref>
Although global and national AMR action plans are in place, infection prevention and control is primarily discussed in the context of healthcare facilities with home and everyday life settings barely addressed.</p>
<p id="para0011">As seen with the recent global pandemic of coronavirus SARS-CoV-2, everyday hygiene measures can play an important role in containing and delaying the threat from infectious microorganisms and when employed at other times, are likely to reduce disease for which antibiotics would be prescribed or even mis-prescribed.</p>
<p id="para0012">At the time of writing this review and according to Dr Maarten van Dongen, founder of AMR Insights, the global deaths from SARS-CoV-2 between November 2019 and March 2020 reached 16,500 with many affected succumbing to secondary bacterial infections. In comparison, 2000 people worldwide die as a result of resistant bacteria every day,
<xref rid="bib0008" ref-type="bibr">
<sup>8</sup>
</xref>
amounting to 258,000 people dying from the effects of AMR within a similar time-frame.</p>
<p id="para0013">The latest analysis by the World Health Organization's (WHO) Global Antimicrobial Resistance Surveillance (GLASS) program, which included data from 49 countries, found high levels of AMR in
<italic>Escherichia coli, Klebsiella pneumoniae, Salmonella</italic>
spp.,
<italic>Acinetobacter</italic>
spp.,
<italic>Staphylococcus aureus</italic>
and
<italic>Streptococcus pneumoniae</italic>
in every WHO region.
<xref rid="bib0002" ref-type="bibr">
<sup>2</sup>
</xref>
</p>
<p id="para0014">The global impact is already profound and expected to intensify, particularly among the poorest nations.
<xref rid="bib0003" ref-type="bibr">
<sup>3</sup>
</xref>
<sup>,</sup>
<xref rid="bib0004" ref-type="bibr">
<sup>4</sup>
</xref>
The main driver is overuse and misuse of antibiotics in medicine and agriculture including unregulated over-the-counter sales, while global spread of resistant bacteria or resistance genes is attributed to poor infection prevention and control in healthcare facilities, and sub-optimal hygiene and sanitation in communities, confounded by poor infrastructure and weak governance.
<xref rid="bib0005" ref-type="bibr">
<sup>5</sup>
</xref>
In the US, between 80-90% of the volume of human antibiotic use occurs in the outpatient setting, with nearly 50% considered to be inappropriate or unnecessary.
<xref rid="bib0006" ref-type="bibr">
<sup>6</sup>
</xref>
Without prompt action, it is estimated that rates of AMR to commonly-used antibiotics could exceed 40–60% in some countries by 2030,
<xref rid="bib0007" ref-type="bibr">
<sup>7</sup>
</xref>
and by 2050, around 10 million people could die each year as a result of resistance to antibiotics and other antimicrobial agents.
<xref rid="bib0008" ref-type="bibr">
<sup>8</sup>
</xref>
Almost 9 million of these will be in Africa and Asia.
<xref rid="bib0008" ref-type="bibr">
<sup>8</sup>
</xref>
</p>
<p id="para0015">In 2015, an alliance of the WHO, the Food and Agriculture Organization of the United Nations (FAO) and the World Organization for Animal Health (OIE) developed a Global Action Plan (GAP) to: “improve awareness and understanding of AMR through effective communication, education and training, strengthen the knowledge and evidence base through surveillance and research, reduce the incidence of infection through effective sanitation, hygiene and infection prevention measures, optimize the use of antimicrobial medicines in human and animal health, and, develop the economic case for sustainable investment that takes account of the needs of all countries and to increase investment in new medicines, diagnostic tools, vaccines and other interventions.”
<xref rid="bib0009" ref-type="bibr">
<sup>9</sup>
</xref>
The GAP emphasizes the need for society-wide engagement, with a clear focus on “prevention first.”
<sup>9</sup>
One of the five strategic objectives is a reduction in the incidence of infection through improved sanitation, hygiene, and infection prevention.
<xref rid="bib0009" ref-type="bibr">
<sup>9</sup>
</xref>
At least 120 countries have finalized national action plans, with the plans of more than 60 other countries under development.
<xref rid="bib0010" ref-type="bibr">
<sup>10</sup>
</xref>
</p>
<p id="para0016">What is striking is that the GAP and national plans discuss infection prevention and control primarily in the context of healthcare facilities. (See
<ext-link ext-link-type="uri" xlink:href="https://www.who.int/antimicrobialresistance/national-action-plans/library/en/" id="interref0001">https://www.who.int/antimicrobialresistance/national-action-plans/library/en/</ext-link>
). By contrast, the latest 2019 UK national action plan, which sets out a 20-year vision
<xref rid="bib0011" ref-type="bibr">
<sup>11</sup>
</xref>
and a 5-year plan
<xref rid="bib0012" ref-type="bibr">
<sup>12</sup>
</xref>
for how the UK will contribute to controlling AMR by 2040, offers guidelines on infection prevention in healthcare settings, but also highlights the role of the community, noting that, when it comes to infections in the community, the public have a huge part to play.
<xref rid="bib0012" ref-type="bibr">
<sup>12</sup>
</xref>
The plan emphasizes the importance of e-bug (
<ext-link ext-link-type="uri" xlink:href="http://www.e-bu.eu" id="interref0002">www.e-bu.eu</ext-link>
), an educational program developed by Public Health England which aims to ensure that all children across Europe leave school with an understanding of AMR and the role of hand, food and respiratory hygiene in prevention of infections.</p>
<p id="para0017">This paper is the output of a scientific meeting commissioned by The Global Hygiene Council involving an invited group of experts from the fields of microbiology, AMR, hygiene and public health. The paper is not a systematic review, which has already been undertaken by others, including the International Scientific Forum on Home Hygiene (IFH) (
<ext-link ext-link-type="uri" xlink:href="http://www.ifhhomehygiene.org" id="interref0003">http://www.ifhhomehygiene.org</ext-link>
), but presents key evidence that the home and other everyday life settings are important for the transmission of infections and the acquisition and spread of AMR, and that home and everyday life hygiene should be given greater consideration in global and national action plans. It is also important to acknowledge that while hygiene measures are a vital part of infection prevention, addressing the rising threat of AMR requires a holistic approach which includes reducing the use of antibiotics in agriculture, introducing tighter regulations of over the counter sales and improving access to clean water and sanitation.
<xref rid="bib0013" ref-type="bibr">
<sup>13</sup>
</xref>
</p>
<p id="para0018">Adopting a targeted hygiene approach in our homes and everyday lives (including workplaces, schools, nurseries, on public transport, during leisure activities etc) offers a way to maximize protection against colonization and infection, at the times and places where there is the greatest risk of transmission. This in turn reduces the need for antibiotics, thereby minimizing the selection pressure for development of AMR.</p>
</sec>
<sec id="sec0002">
<title>IMPORTANCE OF THE HOME AND EVERYDAY LIFE SETTINGS IN THE SPREAD OF INFECTION</title>
<p id="para0019">In recent years, demographic changes and changes in health service structure mean that the number of people living in the community needing special care, because they are at greater risk of infection, has significantly increased. The largest proportion of these are the elderly, who generally have reduced immunity to infection which is often exacerbated by other illnesses like diabetes and malignant illnesses. A decrease in immunity usually starts from 50 years old.</p>
<p id="para0020">Other infection-susceptible groups include the very young, patients recently discharged from hospital, and family members with invasive devices such as catheters, as well as those whose immune competence is impaired as a result of chronic and degenerative illnesses (including HIV/AIDS) or because they are receiving immunosuppressant drugs or other therapies. Immunosuppressed individuals are often also on other medications such as antibiotics, to help protect them from infection but can further increase susceptibility to infections such as
<italic>Clostridium difficile.</italic>
</p>
<p id="para0021">Home and everyday life settings provide multiple opportunities for spread of infection. Everyday life settings include locations where normally there is no mandated hygiene policy as is typically found in clinical and educational settings; for example: work places, public transport, gyms, child day-care facilities, and shopping centers.</p>
<p id="para0022">Poor hygiene is considered a major factor in the transmission of community-based infections, including gastrointestinal (GI) and respiratory tract (RT) infections such as colds and influenza, and skin infections caused by
<italic>S. aureus</italic>
.
<xref rid="bib0014" ref-type="bibr">
<sup>14</sup>
</xref>
For the elderly, communal living environments, combined with problems of fecal incontinence, create an environment in which enteric and foodborne pathogens are easily spread. As a result, the incidence of
<italic>salmonellosis</italic>
and
<italic>Campylobacter</italic>
diarrhea appears to be higher among the elderly in these situations.</p>
<p id="para0023">More vulnerable ‘at risk’ members of society are now being looked after outside hospital settings. For example, in Germany, it is estimated that approximately three quarters of all people in need of care are currently being cared for at home.
<xref rid="bib0015" ref-type="bibr">
<sup>15</sup>
</xref>
In the community the immunocompromised are also at risk from opportunistic pathogens such as
<italic>E. coli, Klebsiella</italic>
spp., and
<italic>Pseudomonas aeruginosa</italic>
, which are considered as hospital related.
<xref rid="bib0015" ref-type="bibr">
<sup>15</sup>
</xref>
</p>
<p id="para0024">The key steps in preventing the spread of infection, known as breaking the chain of infection, are the same regardless of setting. In the home, pathogens may have been brought home from hospital settings or enter the home via colonized or infected people, pets/domestic animals, or through contaminated food and water.
<xref rid="bib0015" ref-type="bibr">
<sup>15</sup>
</xref>
<sup>,</sup>
<xref rid="bib0016" ref-type="bibr">
<sup>16</sup>
</xref>
Pathogens and other microbes are shed constantly from these sources, with rapid transmission around the home mainly via hands, hand and food contact surfaces, cleaning utensils and in the air (
<xref rid="fig0001" ref-type="fig">Figure 1</xref>
).
<xref rid="bib0015" ref-type="bibr">
<sup>15</sup>
</xref>
<fig id="fig0001">
<label>Figure 1</label>
<caption>
<p>The chain of infection in the home and everyday environments (adapted with permission from the IFH, see reference 15)</p>
</caption>
<alt-text id="alt0001">Figure 1</alt-text>
<graphic xlink:href="gr1_lrg"></graphic>
</fig>
</p>
<p id="para0025">Multiple studies conducted in home and everyday life situations demonstrate that pathogens on hands and surfaces can be transferred from an infected person spread via hands and surfaces, from feces, via respiratory droplets and from handling and preparing contaminated food, and can survive and disseminate in numbers sufficient to cause infection.
<xref rid="bib0015" ref-type="bibr">
<sup>15</sup>
</xref>
<sup>,</sup>
<xref rid="bib0016" ref-type="bibr">
<sup>16</sup>
</xref>
These studies involve species including
<italic>C. difficile</italic>
<xref rid="bib0017" ref-type="bibr">
<sup>17</sup>
</xref>
,
<italic>Salmonella spp., Campylobacter spp., S.</italic>
a
<italic>ureus, E. coli</italic>
,
<xref rid="bib0018" ref-type="bibr">18</xref>
,
<xref rid="bib0019" ref-type="bibr">19</xref>
,
<xref rid="bib0020" ref-type="bibr">20</xref>
,
<xref rid="bib0021" ref-type="bibr">21</xref>
,
<xref rid="bib0022" ref-type="bibr">22</xref>
<italic>Listeria monocytogenes,</italic>
<xref rid="bib0023" ref-type="bibr">
<sup>23</sup>
</xref>
<sup>,</sup>
<xref rid="bib0024" ref-type="bibr">
<sup>24</sup>
</xref>
norovirus,
<xref rid="bib0025" ref-type="bibr">25</xref>
,
<xref rid="bib0026" ref-type="bibr">26</xref>
,
<xref rid="bib0027" ref-type="bibr">27</xref>
rhinovirus,
<xref rid="bib0028" ref-type="bibr">
<sup>28</sup>
</xref>
influenza virus
<xref rid="bib0027" ref-type="bibr">
<sup>27</sup>
</xref>
<sup>,</sup>
<xref rid="bib0029" ref-type="bibr">
<sup>29</sup>
</xref>
and SARS-CoV-2.
<xref rid="bib0030" ref-type="bibr">
<sup>30</sup>
</xref>
</p>
<p id="para0026">A study
<xref rid="bib0018" ref-type="bibr">
<sup>18</sup>
</xref>
involving preparation of
<italic>Salmonella</italic>
and
<italic>Campylobacter</italic>
-contaminated chickens (N=20) in domestic kitchens showed transfer of the pathogen to 10.1 and 7.2% respectively of contact surfaces (hands, cleaning cloths, chopping boards, utensils, tap handles, and cupboard door handles). In a follow up study,
<xref rid="bib0031" ref-type="bibr">
<sup>31</sup>
</xref>
hands, chopping board and cloth samples yielded Most Probable Number (MPN) counts of >100 and >1000
<italic>Salmonella</italic>
per sample from 13.3 and 8% respectively. For
<italic>Campylobacter</italic>
, counts of >100 and >1000 were isolated from 5 and 1.7% respectively. This is a concern, since it is estimated that 80% of
<italic>Salmonella</italic>
infections originate in the home,
<xref rid="bib0032" ref-type="bibr">
<sup>32</sup>
</xref>
and a UK study detected
<italic>Campylobacter</italic>
spp. in 56% of chilled retail chickens, with 7% of samples containing >1000 colony forming units (CFU)/g of skin.
<xref rid="bib0033" ref-type="bibr">
<sup>33</sup>
</xref>
The infectious dose of
<italic>Campylobacter</italic>
is estimated at <500 CFU.
<xref rid="bib0034" ref-type="bibr">
<sup>34</sup>
</xref>
Chaidez et al.
<xref rid="bib0035" ref-type="bibr">
<sup>35</sup>
</xref>
demonstrated that the risk of
<italic>Salmonella</italic>
transmission from cleaning cloths via hands to mouth was far higher than the guideline levels for acceptable risk.</p>
<p id="para0027">Since most pathogenic organisms die relatively rapidly, particularly on dry surfaces, the greatest risk of human exposure presents immediately after shedding from an infected or contaminated source. However some species, including
<italic>S. aureus, E. coli,</italic>
and other organisms such as fungal species, rhinovirus, and norovirus can survive for long periods even on dry surfaces.
<xref rid="bib0036" ref-type="bibr">
<sup>36</sup>
</xref>
Audit studies suggest that some Gram-negative organisms can form permanent reservoirs or secondary sources of contamination, particularly where moisture is present such as in sinks and drains, kitchen cleaning cloths and sponges.
<xref rid="bib0037" ref-type="bibr">37</xref>
,
<xref rid="bib0038" ref-type="bibr">38</xref>
,
<xref rid="bib0039" ref-type="bibr">39</xref>
,
<xref rid="bib0040" ref-type="bibr">40</xref>
,
<xref rid="bib0041" ref-type="bibr">41</xref>
To what extent these reservoirs of contamination might include potentially harmful species is not known. However, a study conducted in Culiacan, Mexico, detected
<italic>Salmonella</italic>
in 173/180 (96%) kitchen cleaning cloths taken from domestic homes, with an average MPN
<italic>Salmonella</italic>
count of 661.
<xref rid="bib0035" ref-type="bibr">
<sup>35</sup>
</xref>
Although further investigation is required, this suggests that
<italic>Salmonella</italic>
may be multiplying in the cloths to form a permanent reservoir.</p>
<p id="para0028">Infection risk depends on the level of exposure to pathogenic organisms. The “infectious dose” of bacteria and viruses (i.e. the number of bacterial cells or virus particles required to cause a significant risk of infection) varies for different organisms and in different situations.
<xref rid="bib0042" ref-type="bibr">
<sup>42</sup>
</xref>
<sup>,</sup>
<xref rid="bib0043" ref-type="bibr">
<sup>43</sup>
</xref>
The infectious dose for commonly-encountered bacteria such as
<italic>Campylobacter, Shigella</italic>
, enterohemorrhagic
<italic>E. coli</italic>
(EHEC) and
<italic>C. difficile</italic>
, and viruses such as norovirus and rhinovirus, may be small (1-500 particles or cells).
<xref rid="bib0044" ref-type="bibr">44</xref>
,
<xref rid="bib0045" ref-type="bibr">45</xref>
,
<xref rid="bib0046" ref-type="bibr">46</xref>
,
<xref rid="bib0047" ref-type="bibr">47</xref>
,
<xref rid="bib0048" ref-type="bibr">48</xref>
,
<xref rid="bib0049" ref-type="bibr">49</xref>
For others (e.g.
<italic>Salmonella</italic>
), it can be far greater (∼10
<sup>6</sup>
organisms).
<xref rid="bib0044" ref-type="bibr">
<sup>44</sup>
</xref>
The dose also depends on host susceptibility and mode of entry, and may be lower for at-risk groups in the community such as children, the elderly, and people with compromised immunity.
<xref rid="bib0044" ref-type="bibr">
<sup>44</sup>
</xref>
</p>
<p id="para0029">Although care of increasing numbers of patients in the community, including at home can help alleviate over-burdened health systems, it can be undermined by inadequate infection control in the home and urgent focus is now needed on infection transmission in homes and community settings in addition to healthcare settings.</p>
</sec>
<sec id="sec0003">
<title>AMR BACTERIA IN THE HOME AND COMMUNITY ENVIRONMENTS</title>
<p id="para0030">Although multidrug-resistant (MDR) bacteria (i.e. bacteria that have acquired resistance to at least one agent in three or more antimicrobial classes) are typically hospital-acquired,
<xref rid="bib0050" ref-type="bibr">
<sup>50</sup>
</xref>
studies conducted primarily in high-income countries show that some have become quite prevalent in the community.
<xref rid="bib0051" ref-type="bibr">
<sup>51</sup>
</xref>
Infected or colonized patients discharged from healthcare settings can remain persistent skin carriers of methicillin-resistant
<italic>Staphylococcus aureus</italic>
(MRSA), or fecal carriers of enterobacteria strains which carry MDR factors (e.g. New Delhi metallo-beta-lactamase 1 [NDM-1] or extended spectrum beta-lactamase [ESBL] enzymes). Many community-onset infections are associated with recent discharge from a healthcare setting.
<xref rid="bib0052" ref-type="bibr">52</xref>
,
<xref rid="bib0053" ref-type="bibr">53</xref>
,
<xref rid="bib0054" ref-type="bibr">54</xref>
,
<xref rid="bib0055" ref-type="bibr">55</xref>
,
<xref rid="bib0056" ref-type="bibr">56</xref>
MDR strains can be passed to other family members who become infected or colonized
<xref rid="bib0056" ref-type="bibr">
<sup>56</sup>
</xref>
although carrier status is often not apparent as colonization does not necessary results in clinical disease.</p>
<p id="para0031">Factors affecting the spread of MDR bacteria into home and everyday life settings are complex. Methicillin-resistant
<italic>S. aureus</italic>
(MRSA) is probably the most important MDR bacterium to transition from healthcare settings to the community. The ease of transfer of MRSA from hospitals to the home via healthcare workers and others in contact with hospitals has been demonstrated in multiple studies.
<xref rid="bib0052" ref-type="bibr">52</xref>
,
<xref rid="bib0053" ref-type="bibr">53</xref>
,
<xref rid="bib0054" ref-type="bibr">54</xref>
,
<xref rid="bib0055" ref-type="bibr">55</xref>
,
<xref rid="bib0056" ref-type="bibr">56</xref>
This is illustrated by a study
<xref rid="bib0057" ref-type="bibr">
<sup>57</sup>
</xref>
where significant levels of community and hospital strains of MRSA were recovered from high-frequency touch surfaces (door handles, toilet seats, reception areas, public washrooms, corridors and lifts) in public areas in the community and in London hospitals, suggesting cross-contamination between the two settings. Once in the home, MRSA can colonize and/or cause infection among family members.
<xref rid="bib0058" ref-type="bibr">58</xref>
,
<xref rid="bib0059" ref-type="bibr">59</xref>
,
<xref rid="bib0060" ref-type="bibr">60</xref>
</p>
<p id="para0032">Other studies show the spread of MRSA from a colonized index case (e.g. a nurse) at work to the home environment and other family members.
<xref rid="bib0056" ref-type="bibr">
<sup>56</sup>
</xref>
Antibiotic treatment of family members failed to eradicate colonization because they became recolonized from contaminated environmental surfaces. Eradication was only successful when antibiotic treatment was combined with rigorous cleaning of the home environment.
<xref rid="bib0056" ref-type="bibr">
<sup>56</sup>
</xref>
Further studies on spread of MRSA in the home environment are reviewed by Bloomfield et al; 2012.
<xref rid="bib0043" ref-type="bibr">
<sup>43</sup>
</xref>
</p>
<p id="para0033">Since 2000, we have seen the emergence of new “community acquired” strains of MRSA (CA-MRSA). While healthcare-associated strains are mainly a risk to vulnerable people, for CA-MRSA, any family member is at risk and it is more prevalent among children and young adults where they cause infections of cuts, wounds and abrasions. US experience suggests the risk is greatest among those engaging skin-to-skin contact activities and contact with contaminated objects such as towels, sheets and sports equipment. Transmission is common in settings such as prisons, schools and sports teams.
<xref rid="bib0043" ref-type="bibr">
<sup>43</sup>
</xref>
A study assessing the transmission of CA-MRSA in a university in the US, found multidrug resistant USA300 responsible for diseases including necrotizing pneumonia, severe sepsis and necrotizing fasciitis, on common touch surfaces at the university, student homes and local community settings. This suggests transfer between different locations within the community.
<xref rid="bib0061" ref-type="bibr">
<sup>61</sup>
</xref>
</p>
<p id="para0034">
<italic>Enterobacterales</italic>
are a common cause of community-associated infections, including urinary tract infections and bacteremia as well as gastrointestinal infections.
<xref rid="bib0052" ref-type="bibr">
<sup>52</sup>
</xref>
Resistance in community-associated
<italic>Enterobacterales</italic>
mediated by extended spectrum β-lactamases is now common in Asia, the Middle East, South America and some parts of Europe. A 2012 study in Birmingham, UK indicated that the proportion of
<italic>E. coli</italic>
carrying CTX-M ESBL genotypes in a community population was 11.3%,
<xref rid="bib0062" ref-type="bibr">
<sup>62</sup>
</xref>
while a 2006-2011 study
<xref rid="bib0063" ref-type="bibr">
<sup>63</sup>
</xref>
reported a 10-fold increase (from 0.6% and 6%) in ESBL-producing
<italic>E. coli</italic>
fecal carriage in healthy subjects in a Parisian community. Lower-prevalence regions include North America, parts of Northern Europe, Australia and New Zealand.
<xref rid="bib0052" ref-type="bibr">
<sup>52</sup>
</xref>
</p>
<p id="para0035">According to the WHO, foodborne pathogens, including most commonly
<italic>Salmonella, Campylobacter</italic>
and
<italic>E.coli</italic>
affect millions of people globally every year, causing diarrhea or debilitating infections.
<xref rid="bib0064" ref-type="bibr">
<sup>64</sup>
</xref>
Data from 18 European countries suggests that about 31% of foodborne outbreaks occur in private homes.
<xref rid="bib0016" ref-type="bibr">
<sup>16</sup>
</xref>
Foodborne infections associated with these pathogens can be effectively treated by a course of antibiotics, but, for infections caused by consumption of foods contaminated with antibiotic resistant strains, this is not possible.</p>
<p id="para0036">Recent reports indicate the importance of food as a potential source of ESBL-producing organisms, explaining in part the spread of such organisms to community settings.
<xref rid="bib0065" ref-type="bibr">
<sup>65</sup>
</xref>
Poor hygiene with contaminated chopping boards and sponges have been found to be the potential cause of the spread of ESBLs in community settings. For example, in a study conducted in Switzerland, France and Germany, where 144 cutting boards used in domestic homes were examined after preparation of chicken, meat or game, ESBL-producing
<italic>E. coli</italic>
was recovered from 5 samples (3.5%).
<xref rid="bib0066" ref-type="bibr">
<sup>66</sup>
</xref>
An Italian study, of 100 “in-use” kitchen sponges, found high levels of
<italic>Enterobacteriaceae</italic>
(5.89 log CFU/g). Identification of enterobacteria revealed several opportunistic and pathogenic agents, including
<italic>Enterobacter cloacae</italic>
(28%),
<italic>Citrobacter freundii</italic>
(23%), and
<italic>Cronobacter sakazakii</italic>
(15.1%)
<italic>.</italic>
In total, 69/309 (22%) of enterobacteria strains tested were ESBL-positive.
<xref rid="bib0067" ref-type="bibr">
<sup>67</sup>
</xref>
Kitchen sponges not only act as reservoirs of microorganisms, but also as disseminators over domestic surfaces, which can lead to cross-contamination of hands and food, which is considered a main cause of foodborne disease outbreaks.</p>
<p id="para0037">Carbapenem-resistant
<italic>Enterobacteriaceae</italic>
(CRE) are also on the rise globally, but, to date, most CRE infections in the US and Europe have been healthcare-associated.
<xref rid="bib0068" ref-type="bibr">
<sup>68</sup>
</xref>
<sup>,</sup>
<xref rid="bib0070" ref-type="bibr">
<sup>70</sup>
</xref>
Although data from Asia is sparse, carbapenemases have been found in bacteria recovered from drinking water in India and in food-producing animals in China.
<xref rid="bib0069" ref-type="bibr">
<sup>69</sup>
</xref>
<sup>,</sup>
<xref rid="bib0071" ref-type="bibr">
<sup>71</sup>
</xref>
<sup>,</sup>
<xref rid="bib0072" ref-type="bibr">
<sup>72</sup>
</xref>
In European studies during the 1990s, vancomycin-resistant enterococci (VRE) were detected in the stools of healthy volunteers.
<xref rid="bib0073" ref-type="bibr">73</xref>
,
<xref rid="bib0074" ref-type="bibr">74</xref>
,
<xref rid="bib0075" ref-type="bibr">75</xref>
,
<xref rid="bib0076" ref-type="bibr">76</xref>
,
<xref rid="bib0077" ref-type="bibr">77</xref>
However, rates of VRE, carbapenem resistance in
<italic>Acinetobacter</italic>
infections, and MDR
<italic>P. aeruginosa</italic>
are thought to be low in individuals living in the community.
<xref rid="bib0052" ref-type="bibr">
<sup>52</sup>
</xref>
</p>
<p id="para0038">Overall, the evidence suggests that MDR strains of bacteria, like any other strains of bacteria, can enter the home or other settings via people who are infected or colonized or via contaminated food and can be spread to other members of the family via hands and contaminated surfaces.</p>
</sec>
<sec id="sec0004">
<title>THE ROLE OF TARGETED HOME AND EVERYDAY LIFE HYGIENE IN TACKLING ANTIBIOTIC RESISTANCE</title>
<p id="para0039">If implemented effectively, home and everyday life hygiene has the potential to reduce rates of infection and the need for antibiotic prescriptions, thereby reducing the selective pressure for the development and subsequent dissemination of resistance.
<xref rid="bib0016" ref-type="bibr">
<sup>16</sup>
</xref>
<sup>,</sup>
<xref rid="bib0078" ref-type="bibr">
<sup>78</sup>
</xref>
As witnessed in the recent global efforts to contain SARS-CoV-2 virus and delay the spread of Covid-19, hygiene practices including hand-washing are the first line of defense to reduce the transmission of infection. Targeted hygiene also helps to reduce spread of bacterial species with a low degree of pathogenicity (opportunistic pathogens) such as, enterococci, that are known to contain MDR determinants. These can form reservoirs of resistance determinants, which can be disseminated by horizontal transfer to other pathogenic species.
<xref rid="bib0079" ref-type="bibr">
<sup>79</sup>
</xref>
</p>
<sec id="sec0005">
<title>What is targeted hygiene?</title>
<p id="para0040">Targeted hygiene is a risk management system developed for home and everyday life settings during the 1980s.
<xref rid="bib0080" ref-type="bibr">
<sup>80</sup>
</xref>
It is based on scientifically-validated systems developed by the food and other manufacturing sectors as the most effective means to protect products from contamination. Studies on consumer understanding of hygiene show that the public are very confused about hygiene and what hygiene really means, tending to equate it with eradication of dirt, assumed to be the major source of harmful microbes.
<xref rid="bib0081" ref-type="bibr">
<sup>81</sup>
</xref>
<sup>,</sup>
<xref rid="bib0082" ref-type="bibr">
<sup>82</sup>
</xref>
Targeted hygiene means focusing hygiene practices in places and at times (referred to as “risk moments”) when harmful microbes are most likely to be spread, in order to break the chain of infection transmission. The key risk moments within home and everyday settings include food handling, using the toilet and changing a baby's diaper/nappy, touching surfaces frequently touched by others, coughing, sneezing and nose blowing, handling and laundering clothing and household linen, caring for domestic animals, disposing of refuse, and caring for an infected family member who is shedding infectious microbes into the environment.
<xref rid="bib0015" ref-type="bibr">
<sup>15</sup>
</xref>
<sup>,</sup>
<xref rid="bib0016" ref-type="bibr">
<sup>16</sup>
</xref>
<sup>,</sup>
<xref rid="bib0083" ref-type="bibr">
<sup>83</sup>
</xref>
<sup>,</sup>
<xref rid="bib0084" ref-type="bibr">
<sup>84</sup>
</xref>
</p>
<p id="para0041">Microbiological data
<xref rid="bib0015" ref-type="bibr">
<sup>15</sup>
</xref>
<sup>,</sup>
<xref rid="bib0016" ref-type="bibr">
<sup>16</sup>
</xref>
suggest that the surfaces that are most often responsible for spread of harmful microbes, at key moments include the hands themselves, hand contact surfaces, food contact surfaces, and cleaning cloths and other cleaning items (
<xref rid="fig0002" ref-type="fig">Figure 2</xref>
). These surfaces are referred to as critical surfaces or critical control points. Clothing, household linen, toilets, sinks and bath surfaces may also contribute to establishing a chain of infection, however, the risks associated with these surfaces are typically lower as they rely on the hands and other “chain links” to disseminate infectious microbes to cause human exposure.
<fig id="fig0002">
<label>Figure 2</label>
<caption>
<p>Critical surfaces in the home, ranked by risk of infection transmission (adapted with permission from the IFH – see ref.15)</p>
</caption>
<alt-text id="alt0002">Figure 2</alt-text>
<graphic xlink:href="gr2_lrg"></graphic>
</fig>
</p>
</sec>
<sec id="sec0006">
<title>Breaking the chain of infection</title>
<p id="para0042">An important aspect of targeted hygiene is hygienic cleaning – as opposed to visible cleaning – to break the chain of infection. This is achieved using hygiene procedures (products plus process) to reduce pathogenic microorganisms on critical surfaces to a level where they are no longer harmful to health – thereby preventing ongoing spread.
<xref rid="bib0016" ref-type="bibr">
<sup>16</sup>
</xref>
<sup>,</sup>
<xref rid="bib0084" ref-type="bibr">
<sup>84</sup>
</xref>
Several methods exist to achieve such reduction in potential pathogens: mechanical/physical removal using dry wiping, soap or detergent-based cleaning together with adequate rinsing, inactivation or eradication using a disinfectant on hard surfaces or an alcohol-based sanitizer on the hands, or a physical process such as heating (to ≥60°C/140°F) or ultraviolet treatment. Most frequently, a combination of these approaches is likely to be used.
<xref rid="bib0016" ref-type="bibr">
<sup>16</sup>
</xref>
<sup>,</sup>
<xref rid="bib0084" ref-type="bibr">
<sup>84</sup>
</xref>
</p>
<p id="para0043">When developing hygiene procedures aimed at breaking the chain of infection, the goal should be to ensure that each procedure is appropriate to its intended use. In recent years, risk modelling has been developed in order to achieve this.
<xref rid="bib0080" ref-type="bibr">
<sup>80</sup>
</xref>
Quantitative Microbial Risk Assessment (QMRA) was originally developed for ensuring water quality and is increasingly being used to develop infection prevention control strategies in other settings, including healthcare.
<xref rid="bib0085" ref-type="bibr">
<sup>85</sup>
</xref>
<sup>,</sup>
<xref rid="bib0086" ref-type="bibr">
<sup>86</sup>
</xref>
</p>
<p id="para0044">QMRA is a scientifically-validated approach that uses published data to model the chain of infection and estimate safe residual level of contamination at critical points in the chain.
<xref rid="bib0084" ref-type="bibr">
<sup>84</sup>
</xref>
<sup>,</sup>
<xref rid="bib0087" ref-type="bibr">
<sup>87</sup>
</xref>
This information is then used to estimate the log reduction required to reduce contamination to a safe level. Based on these estimates, tests modelling use conditions can be used to develop effective hygiene procedures to achieve the required reduction. The approach is set out in more detail by Bloomfield et al.
<xref rid="bib0084" ref-type="bibr">
<sup>84</sup>
</xref>
</p>
<p id="para0045">In the past, recommendations on selection of hygiene procedures for home and everyday life were based on the health status of family members, and it is still argued by some that disinfectants should only be used in situations where people are infected or at increased risk of infection.
<xref rid="bib0087" ref-type="bibr">87</xref>
,
<xref rid="bib0088" ref-type="bibr">88</xref>
,
<xref rid="bib0089" ref-type="bibr">89</xref>
However, if home and everyday life hygiene is to be effective, one has to take into account the established evidence from models simulating use conditions showing that, in some risk situations, hygiene procedures that involve just wiping or detergent-based cleaning are insufficient.
<xref rid="bib0019" ref-type="bibr">
<sup>19</sup>
</xref>
<sup>,</sup>
<xref rid="bib0036" ref-type="bibr">
<sup>36</sup>
</xref>
<sup>,</sup>
<xref rid="bib0090" ref-type="bibr">
<sup>90</sup>
</xref>
<sup>,</sup>
<xref rid="bib0091" ref-type="bibr">
<sup>91</sup>
</xref>
</p>
<p id="para0046">Chaidez et al. demonstrated, using QMRA, that twice-daily soaking of kitchen cleaning cloths in sodium hypochlorite disinfectant solution (2.1%) reduced the average 6-week probability of acquiring a
<italic>Salmonella</italic>
infection from handling cloths by almost 100-fold, compared with usual cleaning practices.
<xref rid="bib0036" ref-type="bibr">
<sup>36</sup>
</xref>
</p>
<p id="para0047">Although there is data to show that hygiene is important in preventing transmission of MRSA colonization and infection in the domestic environment, further investigation is required to demonstrate the full extent to which poor home hygiene may contribute to the burden of foodborne infection associated with antibiotic resistant strains.</p>
</sec>
</sec>
<sec id="sec0007">
<title>
<bold>ASSESSING THE IMPACT OF HYGIENE ON INFECTION RATES AND ANTIBIOTIC</bold>
PRESCRIBING</title>
<p id="para0048">Quantifying the impact of hygiene on the burden of infection in home and everyday life is challenging because of the large population sizes required to generate significant results, and difficulties in conducting studies involving multiple interventions. Most data have been generated from single intervention studies – primarily hand hygiene – where meta-analyses show a positive impact on GI and RT infections.
<xref rid="bib0091" ref-type="bibr">91</xref>
,
<xref rid="bib0092" ref-type="bibr">92</xref>
,
<xref rid="bib0093" ref-type="bibr">93</xref>
</p>
<p id="para0049">Children who attend day-care centers have significantly more infections than those who do not. The most common are RT and GI infections, and the risk of otitis media is almost twice that of children remaining at home.
<xref rid="bib0094" ref-type="bibr">
<sup>94</sup>
</xref>
Studies in day-care centers and schools in which hand hygiene was combined with cleaning and/or disinfection of environmental surfaces indicate a positive impact on illness rates and reduction in the use of antibiotics.
<xref rid="bib0094" ref-type="bibr">94</xref>
,
<xref rid="bib0095" ref-type="bibr">95</xref>
,
<xref rid="bib0096" ref-type="bibr">96</xref>
,
<xref rid="bib0097" ref-type="bibr">97</xref>
</p>
<p id="para0050">In an intervention study
<xref rid="bib0096" ref-type="bibr">
<sup>96</sup>
</xref>
in a preschool setting involving enhanced environmental cleaning and disinfection with an emphasis on toys, the number of courses of antibiotics administered to children aged 6 weeks to 5 years was reduced from a median of 0.33 (25–75% interquartile range [IQR] 0.25–0.67) per child per month to 0.28 (25–75% [IQR] 0.17–0.42) (p<0.05). Another 15 month study in 10 day-care centers involving intensified hand-washing, use of alcohol-based disinfectant and disposable towels, cleaning of the day-care center, and regular washing of toys, resulted in 24% (95% CI 22%, 27%) fewer prescriptions of antimicrobials amongst the children and staff (p<0.001).
<sup>94</sup>
A 2018 hand hygiene study at child care centers, reported a 30% reduction of antibiotic prescriptions for RT infections in a group who used hand sanitizers compared with a control group.
<xref rid="bib0098" ref-type="bibr">
<sup>98</sup>
</xref>
Another 2018 intervention study
<xref rid="bib0099" ref-type="bibr">
<sup>99</sup>
</xref>
found that children were prescribed antibiotics for significantly fewer weeks in day care centers using specific disinfecting products and cleaning protocols than centers that continued to use their standard procedures and products (RR=0.68 [95% CI 0.54, 0.86]; p=0.001) – a relative risk reduction of almost one-third.</p>
<p id="para0051">To the best of our knowledge, only one study on the impact of targeted hygiene in the home has been conducted.
<xref rid="bib0100" ref-type="bibr">
<sup>100</sup>
</xref>
This study, conducted among low-income communities in Cape Town, South Africa, evaluated the impact of hygiene education alone and education in combination with hand washing with soap at critical times, bathing at least three times a week, cleaning/disinfecting household surfaces at critical times, and proper waste disposal.
<xref rid="bib0100" ref-type="bibr">
<sup>100</sup>
</xref>
The study reported that children under 5 years of age from the education only households were 2.5-times more likely to experience GI illness (hazard ratio [HR] 2.5; 95% CI 1.17, 4.91) and 4.6-times more likely to experience RT illness (HR 4.6, 95% CI 1.97, 10.54) than those where households implemented the additional hygiene measures. This study suggests the important role a multi-component intervention, including hygiene education and the use of hygiene product, plays in reducing the risk of infections in a home setting. However, according to a recent literature review of 29 studies assessing behavior change interventions designed to increase hand-hygiene and environmental disinfecting in settings likely to include children, in order to widely implement such approaches and see better infection outcomes, significant hygiene behavior change is still needed for communities.
<xref rid="bib0101" ref-type="bibr">
<sup>101</sup>
</xref>
</p>
<p id="para0052">QMRA is also now being used to estimate the impact of hygiene interventions on infection in community settings.
<xref rid="bib0102" ref-type="bibr">
<sup>102</sup>
</xref>
Haas et al.
<xref rid="bib0103" ref-type="bibr">
<sup>103</sup>
</xref>
used QMRA to compare the impact of hand hygiene on transmission from hand to mouth of
<italic>E. coli</italic>
O157:H7 following hand contact with ground/minced beef. It was determined that, if no handwashing was performed, this would result in 0.7 infections per year. By contrast, if all individuals washed their hands with soap following contact with the ground/minced beef, producing a 0.3 log reduction on hands, this would result in an estimated 0.014 infections per year (98% median risk reduction compared with no handwashing). If all individuals used an alcohol-based hand sanitizer following contact with the beef, producing a 4.3 log reduction on the hands, this would result in an estimated 0.00005 infections/year – a 99.9996% median risk reduction for the hand sanitizer compared with handwashing.</p>
<p id="para0053">Duff et al.
<xref rid="bib0104" ref-type="bibr">
<sup>104</sup>
</xref>
developed a computer-based model to estimate the cost-effectiveness of a disinfection program that targeted high-risk food preparation activities in household kitchens. The model estimated that approximately 80,000
<italic>Salmonella, Campylobacter</italic>
, and
<italic>E. coli</italic>
O157 infections could be prevented annually in US homes, resulting in $138 million in direct medical cost savings and a gain of 15,845 quality-adjusted life-years (QALYs). Set against a program cost of $788 million, the program was associated with a favorable cost-effectiveness ratio of $41,021/QALY gained. Results were similar for households in Canada and the UK.</p>
</sec>
<sec id="sec0008">
<title>COULD USE OF MICROBICIDES IN THE HOME AND EVERYDAY LIFE SELECT FOR AMR AND ITS DISSEMINATION?</title>
<p id="para0054">Concern has been expressed as to whether expanding use of microbicidal products, in the home and everyday life may contribute to the rise in AMR.
<xref rid="bib0105" ref-type="bibr">
<sup>105</sup>
</xref>
Sub-lethal levels of microbicides can induce stress on bacterial cells, causing expression of mechanisms that reduce the biocide concentration at the bacterial target site further and allow the bacterial cell to repair.
<xref rid="bib0106" ref-type="bibr">
<sup>106</sup>
</xref>
<sup>,</sup>
<xref rid="bib0107" ref-type="bibr">
<sup>107</sup>
</xref>
These include overexpression of an efflux system, membrane regulatory changes, and changes in membrane permeability and composition.
<xref rid="bib0107" ref-type="bibr">
<sup>107</sup>
</xref>
These same mechanisms can produce changes in the susceptibility profile to unrelated antimicrobials.
<xref rid="bib0107" ref-type="bibr">
<sup>107</sup>
</xref>
In other words, the use of microbicides may cross-select for antibiotic resistance and be associated with reduced antibiotic susceptibility to clinically significant levels (recently reviewed by Maillard
<xref rid="bib0107" ref-type="bibr">
<sup>107</sup>
</xref>
).</p>
<p id="para0055">Factors inherent to the microbicide (i.e. concentration, formulation, mechanism of action), the microorganisms (i.e. type/strain, metabolism, resistance mechanisms), and product usage (e.g. concentration, exposure time), all impact on product efficacy.
<sup>107</sup>
Decreases in efficacy, for example, following shorter contact time or product dilution, will lead to bacterial survival – antimicrobial damage caused by a sub-lethal concentration of a microbicide is likely to be repairable.
<xref rid="bib0107" ref-type="bibr">
<sup>107</sup>
</xref>
</p>
<p id="para0056">A number of expert reports commissioned in the last 10 years have highlighted laboratory studies linking microbicide use with reduced antibiotic susceptibility. However, these reports conclude that there is little evidence for this effect occurring in real-life clinical practice, and have called for further research into whether microbicide use influences antibiotic resistance in the community.
<xref rid="bib0108" ref-type="bibr">108</xref>
,
<xref rid="bib0109" ref-type="bibr">109</xref>
,
<xref rid="bib0110" ref-type="bibr">110</xref>
,
<xref rid="bib0111" ref-type="bibr">111</xref>
</p>
<p id="para0057">Rutala et al
<italic>.</italic>
(2000) found that the frequency of occurrence of antibiotic resistance in environmental isolates from homes was much lower than for clinical isolates from a hospital intensive care unit and an outpatient setting where there was routine extensive use of antibiotics.
<xref rid="bib0112" ref-type="bibr">
<sup>112</sup>
</xref>
</p>
<p id="para0058">Two studies were carried out to investigate whether antibiotic resistant strains were more likely to be found in homes where antibacterial products were used, compared with homes where they were not.
<xref rid="bib0113" ref-type="bibr">
<sup>113</sup>
</xref>
<sup>,</sup>
<xref rid="bib0114" ref-type="bibr">
<sup>114</sup>
</xref>
Samples were collected from houses in the USA and UK of 30 users and nonusers of antibacterials. Susceptibility tests against antibiotics and antibacterial agents (triclosan, pine oil, BAC and para-chloro-meta-xylenol) were carried out on the bacteria isolated. The authors concluded that there was no evidence that antibiotic resistant strains occurred more frequently in user homes compared with non-user homes. A 1-year study by Aiello et al (2005) also showed that household use of antibacterial cleaning products was not a significant risk factor for occurrence of antibiotic resistant isolates from hands.
<xref rid="bib0115" ref-type="bibr">
<sup>115</sup>
</xref>
</p>
<p id="para0059">Despite more than 20 years of research, there is still no conclusive resolution to the question of whether and to what extent; microbicides might contribute to AMR in clinical practice. In light of laboratory data, which indicates that microbicide-induced AMR is biologically plausible for some types of microbicides, it is concluded that use of microbicides needs to be prudent and appropriate and that the products containing them must be used at recommended concentrations and with the appropriate contact time.</p>
<p id="para0060">Targeted hygiene works to ensure that use of disinfectants and hand sanitizers (i.e. microbicides used at the correct concentration and contact time) are confined to situations where there is identifiable risk of spread of harmful microorganisms, ensuring that they play an essential role in tackling AMR. The need for antibiotic prescribing may in fact increase if disinfectants and hand sanitizers are not used as indicated, due to the increased risk of infection and survival of bacteria bearing AMR determinants. These could potentially spread to other areas in the home and on into the community. It is important to note also that preventing viral infections as well as bacterial infections, such as those that cause respiratory and GI infections, can also have a role in reducing AMR as this will eliminate the potential for mis-prescribing or misuse of antibiotics.</p>
</sec>
<sec id="sec0009">
<title>THE NEED FOR TARGETED HYGIENE IN LOW- AND MIDDLE-INCOME COUNTRIES (LMICs)</title>
<p id="para0061">In LMICs and all countries, regardless of their Health Development Index (measurement of a country's overall social and economic development), the principles of targeted hygiene are the same as those for high-income countries (HICs): pathogens from infected or contaminated sources are introduced into the home and other settings and spread via critical surfaces such as hands, frequently touched and food contact surfaces. The major differences are that there are more risk factors for infection, including drug-resistant infections in the community in LMICs as a result of sub-optimal environmental sanitation, lack of environmental regulations, high-density housing, and inadequate access to clean water due to contamination during collection, transportation, storage, and use.
<xref rid="bib0116" ref-type="bibr">
<sup>116</sup>
</xref>
These issues can lead to situations such as those found in India, where unregulated over-the-counter sales of antibiotics, poor sanitation and environmental antibiotic pollution, alongside other behavioral, cultural and social factors, have created ideal conditions for a rapid rise in MDR infections.
<xref rid="bib0117" ref-type="bibr">
<sup>117</sup>
</xref>
<sup>,</sup>
<xref rid="bib0118" ref-type="bibr">
<sup>118</sup>
</xref>
</p>
<p id="para0062">In 2015, an estimated 663 million people around the world were drinking from unimproved water sources, and 2.4 billion had no access to improved sanitation – the vast majority of these were in Sub-Saharan Africa and South Asia.
<xref rid="bib0119" ref-type="bibr">
<sup>119</sup>
</xref>
It is estimated that 2.3 billion people lack the use of sanitation facilities which are not shared with other households,
<xref rid="bib0120" ref-type="bibr">
<sup>120</sup>
</xref>
and 892 million people still defecate in the open, leading to contamination of drinking water sources and spread of disease.
<xref rid="bib0121" ref-type="bibr">
<sup>121</sup>
</xref>
Higher AMR rates in LMICs in which per-capita antibiotic consumption is far lower than in high-income countries, suggests that environmental and other factors are contributing to the increased prevalence of AMR.
<xref rid="bib0005" ref-type="bibr">
<sup>5</sup>
</xref>
</p>
<p id="para0063">A number of audit studies have been conducted evaluating the occurrence of microbes in homes in LMICs, mostly reporting on the presence of coliforms or total counts (see review by Bloomfield et al.).
<xref rid="bib0043" ref-type="bibr">
<sup>43</sup>
</xref>
As with studies conducted in HICs, the highest levels of contamination in LMICs are typically found in moist locations such as kitchen sponges and dishcloths.
<xref rid="bib0122" ref-type="bibr">122</xref>
,
<xref rid="bib0123" ref-type="bibr">123</xref>
,
<xref rid="bib0124" ref-type="bibr">124</xref>
The key question, however, is whether, and to what extent, the incidence and levels of potentially harmful pathogens (and thus infection risks) are higher in homes without access to adequate water and sanitation.</p>
<p id="para0064">Sinclair and Gerba
<xref rid="bib0124" ref-type="bibr">
<sup>124</sup>
</xref>
monitored fecal coliforms, total coliforms,
<italic>E. coli</italic>
and heterotrophic plate count bacteria on household surfaces in 8 homes that had improved latrines (i.e. a pour-flush latrine) in a rural village of Cambodia, and compared the results with similar data from homes in the US
<xref rid="bib0039" ref-type="bibr">
<sup>39</sup>
</xref>
and Japan.
<xref rid="bib0040" ref-type="bibr">
<sup>40</sup>
</xref>
Fecal coliform levels in Cambodia were found to be highest in moist locations such as the plastic ladle used for sink water, the toilet seat surface, and the cutting board surface.
<xref rid="bib0124" ref-type="bibr">
<sup>124</sup>
</xref>
For
<italic>E. coli</italic>
, the mean log CFU per 4 cm
<sup>2</sup>
ranged from 0.5 to 4.0, with highest counts found on the top of the squat toilet, the wash basin, and the floor around the toilet. Fecal coliform levels were 100-fold higher on these surfaces in Cambodia than on equivalent surfaces in the US and Japanese studies.</p>
<p id="para0065">In LMICs, due to a lack of basic sanitation, good hand hygiene is of vital importance.
<xref rid="bib0116" ref-type="bibr">
<sup>116</sup>
</xref>
</p>
<p id="para0066">Globally, it has been estimated that only 19% of the population washes its hands with soap after contact with excreta.
<xref rid="bib0093" ref-type="bibr">
<sup>93</sup>
</xref>
Observations show that hand washing with soap is undertaken in an
<italic>ad hoc</italic>
manner,
<xref rid="bib0116" ref-type="bibr">
<sup>116</sup>
</xref>
with many households having no access to handwashing facilities.
<xref rid="bib0125" ref-type="bibr">
<sup>125</sup>
</xref>
Unsurprisingly, studies in LMICs have reported high levels of fecal indicator bacteria on the hands of household members,
<xref rid="bib0126" ref-type="bibr">126</xref>
,
<xref rid="bib0127" ref-type="bibr">127</xref>
,
<xref rid="bib0128" ref-type="bibr">128</xref>
with one study correlating presence of fecal contamination on the hands with the prevalence of gastrointestinal and respiratory symptoms within the household.
<xref rid="bib0126" ref-type="bibr">
<sup>126</sup>
</xref>
A Cochrane review showed that improving hand washing practices probably reduces diarrhea episodes in child day-care centers in both high income countries and among communities living in low to middle income countries by as much as 30%.
<xref rid="bib0092" ref-type="bibr">
<sup>92</sup>
</xref>
</p>
</sec>
<sec id="sec0010">
<title>CONCLUSIONS</title>
<p id="para0067">The evidence set out in this paper suggests that, if combined with measures ensuring clean water and adequate sanitation, targeted hygiene practices in home and everyday life settings could make a significant contribution to tackling AMR through infection prevention and a consequential reduction in antibiotic prescribing. This is true in all areas of the world including low-income countries.</p>
<p id="para0068">Additionally, the evidence suggests that hygiene promotion would contribute to preventing the transmission of resistant bacteria from the home and everyday life settings, into healthcare settings, and back into the community. Further research is still needed to evaluate the extent to which this might occur, especially in communities in low income countries.</p>
<p id="para0069">To be effective, hygiene interventions need to consider all aspects that are likely to affect the outcome. This includes a reduction of antibiotics from the food chain and the environment, improved hygiene education and availability of appropriate products as well as the provision of clean water and improved sanitation.</p>
<p id="para0070">Based on these findings, the authors of this paper issue a call to action to national and international health policy makers, health agencies, and healthcare professionals to give greater recognition to the importance of hygiene in the home and everyday life and development and promotion or more effective codes of practice for hygiene in the home and everyday life as part of national action plans to tackle AMR. Although the precise impact of hygiene on transmission of infection between community and healthcare settings needs further investigation, it is important to recognise, that reducing the need for antibiotic prescribing and the circulation of AMR strains in healthcare settings cannot be achieved without also reducing circulation of infections and AMR strains in the community. We cannot allow hygiene in home and everyday life settings to become the weak link in the chain.</p>
</sec>
<sec id="sec0011">
<title>Disclosures</title>
<p id="para0071">The development of this position paper was supported by an educational grant from Reckitt Benckiser who fund the activity of the Global Hygiene Council. Medical writing support was provided by the medical communications agency, Spink, which runs the secretariat for the GHC.</p>
</sec>
</body>
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<bold>Conflict of Interest</bold>
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<p id="notep0002">Professor Jean-Yves Maillard is the Director for Biocide Consult Ltd.</p>
<p id="notep0003">Professor Essack is Chairperson of the Global Respiratory Infection Partnership, sponsored by an unrestricted educational grant from Reckitt and Benckiser, UK.</p>
<p id="notep0004">Professor Charles P. has received payments from the following companies for consultancy, advisory boards and grants: Allied Biosciences, Clorox, Ecolab, Georgia Pacific, GOJO Industries, Guest Services, Kimberly Clark, Kohler, Proctor and Gamble, Purethread, Reckitt Benckiser and Unilever India.</p>
<p id="notep0005">Joseph R. Rubino holds the position of R&D Shared Services Director, RB Inc., Germ Protection and Personal Care.</p>
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Data generation: Wed May 6 16:44:09 2020. Site generation: Sun Mar 28 08:26:57 2021