The epidemiology and pathogenesis of coronavirus disease (COVID-19) outbreak
Identifieur interne : 001811 ( Pmc/Corpus ); précédent : 001810; suivant : 001812The epidemiology and pathogenesis of coronavirus disease (COVID-19) outbreak
Auteurs : Hussin A. Rothan ; Siddappa N. ByrareddySource :
- Journal of Autoimmunity [ 0896-8411 ] ; 2020.
Abstract
Coronavirus disease (COVID-19) is caused by SARS-COV2 and represents the causative agent of a potentially fatal disease that is of great global public health concern. Based on the large number of infected people that were exposed to the wet animal market in Wuhan City, China, it is suggested that this is likely the zoonotic origin of COVID-19. Person-to-person transmission of COVID-19 infection led to the isolation of patients that were subsequently administered a variety of treatments. Extensive measures to reduce person-to-person transmission of COVID-19 have been implemented to control the current outbreak. Special attention and efforts to protect or reduce transmission should be applied in susceptible populations including children, health care providers, and elderly people. In this review, we highlights the symptoms, epidemiology, transmission, pathogenesis, phylogenetic analysis and future directions to control the spread of this fatal disease.
Url:
DOI: 10.1016/j.jaut.2020.102433
PubMed: 32113704
PubMed Central: 7127067
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">The epidemiology and pathogenesis of coronavirus disease (COVID-19) outbreak</title><author><name sortKey="Rothan, Hussin A" sort="Rothan, Hussin A" uniqKey="Rothan H" first="Hussin A." last="Rothan">Hussin A. Rothan</name><affiliation><nlm:aff id="aff1">Department of Biology, College of Arts and Sciences, Georgia State University, Atlanta, GA, USA</nlm:aff></affiliation></author><author><name sortKey="Byrareddy, Siddappa N" sort="Byrareddy, Siddappa N" uniqKey="Byrareddy S" first="Siddappa N." last="Byrareddy">Siddappa N. Byrareddy</name><affiliation><nlm:aff id="aff2">Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Centre, Omaha, NE, USA</nlm:aff></affiliation><affiliation><nlm:aff id="aff3">Department of Genetics, Cell Biology and Anatomy, Omaha, NE, USA</nlm:aff></affiliation><affiliation><nlm:aff id="aff4">Department of Biochemistry and Molecular Biology, University of Nebraska Medical Centre, Omaha, NE, USA</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">32113704</idno><idno type="pmc">7127067</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7127067</idno><idno type="RBID">PMC:7127067</idno><idno type="doi">10.1016/j.jaut.2020.102433</idno><date when="2020">2020</date><idno type="wicri:Area/Pmc/Corpus">001811</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">001811</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">The epidemiology and pathogenesis of coronavirus disease (COVID-19) outbreak</title><author><name sortKey="Rothan, Hussin A" sort="Rothan, Hussin A" uniqKey="Rothan H" first="Hussin A." last="Rothan">Hussin A. Rothan</name><affiliation><nlm:aff id="aff1">Department of Biology, College of Arts and Sciences, Georgia State University, Atlanta, GA, USA</nlm:aff></affiliation></author><author><name sortKey="Byrareddy, Siddappa N" sort="Byrareddy, Siddappa N" uniqKey="Byrareddy S" first="Siddappa N." last="Byrareddy">Siddappa N. Byrareddy</name><affiliation><nlm:aff id="aff2">Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Centre, Omaha, NE, USA</nlm:aff></affiliation><affiliation><nlm:aff id="aff3">Department of Genetics, Cell Biology and Anatomy, Omaha, NE, USA</nlm:aff></affiliation><affiliation><nlm:aff id="aff4">Department of Biochemistry and Molecular Biology, University of Nebraska Medical Centre, Omaha, NE, USA</nlm:aff></affiliation></author></analytic><series><title level="j">Journal of Autoimmunity</title><idno type="ISSN">0896-8411</idno><idno type="eISSN">1095-9157</idno><imprint><date when="2020">2020</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Coronavirus disease (COVID-19) is caused by SARS-COV2 and represents the causative agent of a potentially fatal disease that is of great global public health concern. Based on the large number of infected people that were exposed to the wet animal market in Wuhan City, China, it is suggested that this is likely the zoonotic origin of COVID-19. Person-to-person transmission of COVID-19 infection led to the isolation of patients that were subsequently administered a variety of treatments. Extensive measures to reduce person-to-person transmission of COVID-19 have been implemented to control the current outbreak. Special attention and efforts to protect or reduce transmission should be applied in susceptible populations including children, health care providers, and elderly people. In this review, we highlights the symptoms, epidemiology, transmission, pathogenesis, phylogenetic analysis and future directions to control the spread of this fatal disease.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Bogoch" uniqKey="Bogoch">Bogoch</name></author><author><name sortKey="Watts, A" uniqKey="Watts A">A. Watts</name></author><author><name sortKey="Thomas Bachli, A" uniqKey="Thomas Bachli A">A. Thomas-Bachli</name></author><author><name sortKey="Huber, C" uniqKey="Huber C">C. Huber</name></author><author><name sortKey="Kraemer, M U G" uniqKey="Kraemer M">M.U.G. Kraemer</name></author><author><name sortKey="Khan, K" uniqKey="Khan K">K. Khan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Lu, H" uniqKey="Lu H">H. Lu</name></author><author><name sortKey="Stratton, C W" uniqKey="Stratton C">C.W. Stratton</name></author><author><name sortKey="Tang, Y W" uniqKey="Tang Y">Y.W. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">J Autoimmun</journal-id><journal-id journal-id-type="iso-abbrev">J. Autoimmun</journal-id><journal-title-group><journal-title>Journal of Autoimmunity</journal-title></journal-title-group><issn pub-type="ppub">0896-8411</issn><issn pub-type="epub">1095-9157</issn><publisher><publisher-name>Elsevier Ltd.</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">32113704</article-id><article-id pub-id-type="pmc">7127067</article-id><article-id pub-id-type="publisher-id">S0896-8411(20)30046-9</article-id><article-id pub-id-type="doi">10.1016/j.jaut.2020.102433</article-id><article-id pub-id-type="publisher-id">102433</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>The epidemiology and pathogenesis of coronavirus disease (COVID-19) outbreak</article-title></title-group><contrib-group><contrib contrib-type="author" id="au1"><name><surname>Rothan</surname><given-names>Hussin A.</given-names></name><email>hrothan@gsu.edu</email><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author" id="au2"><name><surname>Byrareddy</surname><given-names>Siddappa N.</given-names></name><email>sid.byrareddy@unmc.edu</email><xref rid="aff2" ref-type="aff">b</xref><xref rid="aff3" ref-type="aff">c</xref><xref rid="aff4" ref-type="aff">d</xref><xref rid="cor1" ref-type="corresp">∗</xref></contrib></contrib-group><aff id="aff1"><label>a</label>Department of Biology, College of Arts and Sciences, Georgia State University, Atlanta, GA, USA</aff><aff id="aff2"><label>b</label>Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Centre, Omaha, NE, USA</aff><aff id="aff3"><label>c</label>Department of Genetics, Cell Biology and Anatomy, Omaha, NE, USA</aff><aff id="aff4"><label>d</label>Department of Biochemistry and Molecular Biology, University of Nebraska Medical Centre, Omaha, NE, USA</aff><author-notes><corresp id="cor1"><label>∗</label>Corresponding author. Department of Pharmacology and Experimental Neuroscience Durham Research Center, 8047 985880 Nebraska Medical Center Omaha, NE, 68198-5880, USA <email>sid.byrareddy@unmc.edu</email></corresp></author-notes><pub-date pub-type="pmc-release"><day>26</day><month>2</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="ppub"><month>5</month><year>2020</year></pub-date><pub-date pub-type="epub"><day>26</day><month>2</month><year>2020</year></pub-date><volume>109</volume><fpage>102433</fpage><lpage>102433</lpage><history><date date-type="received"><day>10</day><month>2</month><year>2020</year></date><date date-type="rev-recd"><day>17</day><month>2</month><year>2020</year></date><date date-type="accepted"><day>18</day><month>2</month><year>2020</year></date></history><permissions><copyright-statement>© 2020 Elsevier Ltd. All rights reserved.</copyright-statement><copyright-year>2020</copyright-year><copyright-holder>Elsevier Ltd</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 id="abs0010"><p>Coronavirus disease (COVID-19) is caused by SARS-COV2 and represents the causative agent of a potentially fatal disease that is of great global public health concern. Based on the large number of infected people that were exposed to the wet animal market in Wuhan City, China, it is suggested that this is likely the zoonotic origin of COVID-19. Person-to-person transmission of COVID-19 infection led to the isolation of patients that were subsequently administered a variety of treatments. Extensive measures to reduce person-to-person transmission of COVID-19 have been implemented to control the current outbreak. Special attention and efforts to protect or reduce transmission should be applied in susceptible populations including children, health care providers, and elderly people. In this review, we highlights the symptoms, epidemiology, transmission, pathogenesis, phylogenetic analysis and future directions to control the spread of this fatal disease.</p></abstract><abstract abstract-type="author-highlights" id="abs0015"><title>Highlights</title><p><list list-type="simple" id="ulist0010"><list-item id="u0010"><label>•</label><p id="p0010">Coronavirus disease (COVID-19) represents global public health concern and WHO declares public health emergency.</p></list-item><list-item id="u0015"><label>•</label><p id="p0015">The phylogenetic analysis revealed that COVID-19 is potentially a zoonotic virus.</p></list-item><list-item id="u0020"><label>•</label><p id="p0020">Special attention is necessary to protect or reduce transmission in susceptible populations.</p></list-item><list-item id="u0025"><label>•</label><p id="p0025">COVID-19 develop intestinal symptoms like diarrhea, while low percentage of MERS-CoV or SARS-CoV patients had diarrhea.</p></list-item><list-item id="u0030"><label>•</label><p id="p0030">Identification of novel chemotherapeutic drugs for treating COVID-19 infections is urgently warranted.</p></list-item></list></p></abstract><kwd-group id="kwrds0010"><title>Keywords</title><kwd>Coronavirus</kwd><kwd>COVID-19</kwd><kwd>Wuhan city</kwd><kwd>Pneumonia</kwd><kwd>Pathogenesis</kwd></kwd-group></article-meta></front><body><sec id="sec1"><label>1</label><title>Introduction</title><p id="p0035">Coronavirus is one of the major pathogens that primarily targets the human respiratory system. Previous outbreaks of coronaviruses (CoVs) include the severe acute respiratory syndrome (SARS)-CoV and the Middle East respiratory syndrome (MERS)-CoV which have been previously characterized as agents that are a great public health threat. In late December 2019, a cluster of patients was admitted to hospitals with an initial diagnosis of pneumonia of an unknown etiology. These patients were epidemiologically linked to a seafood and wet animal wholesale market in Wuhan, Hubei Province, China [<xref rid="bib1" ref-type="bibr">1</xref>,<xref rid="bib2" ref-type="bibr">2</xref>]. Early reports predicted the onset of a potential Coronavirus outbreak given the estimate of a reproduction number for the 2019 Novel (New) Coronavirus (COVID-19, named by WHO on Feb 11, 2020) which was deemed to be significantly larger than 1 (ranges from 2.24 to 3.58) [<xref rid="bib3" ref-type="bibr">3</xref>].</p><p id="p0040">The chronology of COVID-19 infections is as follows. The first cases were reported in December 2019 [<xref rid="bib4" ref-type="bibr">4</xref>]. From December 18, 2019 through December 29, 2019, five patients were hospitalized with acute respiratory distress syndrome and one of these patients died[<xref rid="bib5" ref-type="bibr">5</xref>]. By January 2, 2020, 41 admitted hospital patients had been identified as having laboratory-confirmed COVID-19 infection, less than half of these patients had underlying diseases, including diabetes, hypertension, and cardiovascular disease [<xref rid="bib6" ref-type="bibr">6</xref>]. These patients were presumed to be infected in that hospital, likely due to nosocomial infection. It was concluded that the COVID-19 is not a super-hot spreading virus (spread by one patient to many others), but rather likely spread due to many patients getting infected at various locations throughout the hospital through unknown mechanisms. In addition, only patients that got clinically sick were tested, thus there were likely many more patients that were presumably infected. As of January 22, 2020, a total of 571 cases of the 2019-new coronavirus (COVID-19) were reported in 25 provinces (districts and cities) in China [<xref rid="bib7" ref-type="bibr">7</xref>]. The China National Health Commission reported the details of the first 17 deaths up to January 22, 2020. On January 25, 2020, a total of 1975 cases were confirmed to be infected with the COVID-19 in mainland China with a total of 56 deaths [<xref rid="bib8" ref-type="bibr">8</xref>]. Another report on January 24, 2020 estimated the cumulative incidence in China to be 5502 cases [<xref rid="bib9" ref-type="bibr">9</xref>]. As of January 30, 2020, 7734 cases have been confirmed in China and 90 other cases have also been reported from a number of countries that include Taiwan, Thailand, Vietnam, Malaysia, Nepal, Sri Lanka, Cambodia, Japan, Singapore, Republic of Korea, United Arab Emirates, United States, The Philippines, India, Australia, Canada, Finland, France, and Germany. The case fatality rate was calculated to be 2.2% (170/7824) [<xref rid="bib10" ref-type="bibr">10</xref>]. The first case of COVID-19 infection confirmed in the United States led to the description, identification, diagnosis, clinical course, and management of this case. This includes the patient's initial mild symptoms at presentation and progression to pneumonia on day 9 of illness [<xref rid="bib11" ref-type="bibr">11</xref>]. Further, the first case of human-to-human transmission of COVID-19 was reported in the US on January 30, 2020 (<ext-link ext-link-type="uri" xlink:href="https://www.cdc.gov/media/releases/2020/p0130" id="intref0010">https://www.cdc.gov/media/releases/2020/p0130</ext-link>). The CDC has so far screened >30,000 passengers arriving at US airports for the novel coronavirus. Following such initial screening, 443 individuals have been tested for coronavirus infection in 41 states in the USA. Only 15 (3.1%) were tested positive, 347 were negative and results on the remaining 81 are pending (<ext-link ext-link-type="uri" xlink:href="https://www.cdc.gov/coronavirus/2019-ncov" id="intref0015">https://www.cdc.gov/coronavirus/2019-ncov</ext-link>). A report published in Nature revealed that Chinese health authorities concluded that as of February 7, 2019, there have been 31,161 people who have contracted the infection in China, and more than 630 people have died (<ext-link ext-link-type="uri" xlink:href="http://www.nature.com/articles/d41586-020-00154" id="intref0025">http://www.nature.com/articles/d41586-020-00154</ext-link>) of infection. At the time of preparing this manuscript, the World Health Organisation (WHO) reported 51,174 confirmed cases including 15, 384 severe cases and 1666 death cases in China. Globally, the number of confirmed cases as of this writing (February 16, 2020) has reached 51,857 in 25 countries (<ext-link ext-link-type="uri" xlink:href="https://www.who.int/docs/default-source/coronaviruse/situation-reports" id="intref0030">https://www.who.int/docs/default-source/coronaviruse/situation-reports</ext-link>) (<xref rid="fig1" ref-type="fig">Fig. 1</xref>).<fig id="fig1"><label>Figure 1</label><caption><p>The chronological incidence of COVID-19 infections and death cases in China. Infections with COVID-19 appears in December 2019. At the time of preparing this manuscript, February 16, 2020 there have been 51,174 people who have contracted the infection in China, and more than 1666 people have died.</p></caption><alt-text id="alttext0010">Figure 1</alt-text><graphic xlink:href="gr1_lrg"></graphic></fig></p></sec><sec id="sec2"><label>2</label><title>Symptoms</title><p id="p0045">The symptoms of COVID-19 infection appear after an incubation period of approximately 5.2 days [<xref rid="bib12" ref-type="bibr">12</xref>]. The period from the onset of COVID-19 symptoms to death ranged from 6 to 41 days with a median of 14 days [<xref rid="bib8" ref-type="bibr">8</xref>]. This period is dependent on the age of the patient and status of the patient's immune system. It was shorter among patients >70-years old compared with those under the age of 70 [<xref rid="bib8" ref-type="bibr">8</xref>]. The most common symptoms at onset of COVID-19 illness are fever, cough, and fatigue, while other symptoms include sputum production, headache, haemoptysis, diarrhoea, dyspnoea, and lymphopenia [<xref rid="bib5" ref-type="bibr">5</xref>,<xref rid="bib6" ref-type="bibr">6</xref>,<xref rid="bib8" ref-type="bibr">8</xref>,<xref rid="bib13" ref-type="bibr">13</xref>]. Clinical features revealed by a chest CT scan presented as pneumonia, however, there were abnormal features such as RNAaemia, acute respiratory distress syndrome, acute cardiac injury, and incidence of grand-glass opacities that led to death [<xref rid="bib6" ref-type="bibr">6</xref>]. In some cases, the multiple peripheral ground-glass opacities were observed in subpleural regions of both lungs [<xref rid="bib14" ref-type="bibr">14</xref>] that likely induced both systemic and localized immune response that led to increased inflammation. Regrettably, treatment of some cases with interferon inhalation showed no clinical effect and instead appeared to worsen the condition by progressing pulmonary opacities [<xref rid="bib14" ref-type="bibr">14</xref>] (<xref rid="fig2" ref-type="fig">Fig. 2</xref>).<fig id="fig2"><label>Fig. 2</label><caption><p>The systemic and respiratory disorders caused by COVID-19 infection. The incubation period of COVID-19 infection is approximately 5.2 days. There are general similarities in the symptoms between COVID-19 and previous betacoronavirus. However, COVID-19 showed some unique clinical features that include the targeting of the lower airway as evident by upper respiratory tract symptoms like rhinorrhoea, sneezing, and sore throat. Additionally, patients infected with COVID-19 developed intestinal symptoms like diarrhoea only a low percentage of MERS-CoV or SARS-CoV patients exhibited diarrhoea.</p></caption><alt-text id="alttext0015">Fig. 2</alt-text><graphic xlink:href="gr2_lrg"></graphic></fig></p><p id="p0050">It is important to note that there are similarities in the symptoms between COVID-19 and earlier betacoronavirus such as fever, dry cough, dyspnea, and bilateral ground-glass opacities on chest CT scans [<xref rid="bib6" ref-type="bibr">6</xref>]. However, COVID-19 showed some unique clinical features that include the targeting of the lower airway as evident by upper respiratory tract symptoms like rhinorrhoea, sneezing, and sore throat [<xref rid="bib15" ref-type="bibr">15</xref>,<xref rid="bib16" ref-type="bibr">16</xref>]. In addition, based on results from chest radiographs upon admission, some of the cases show an infiltrate in the upper lobe of the lung that is associated with increasing dyspnea with hypoxemia [<xref rid="bib17" ref-type="bibr">17</xref>]. Importantly, whereas patients infected with COVID-19 developed gastrointestinal symptoms like diarrhoea, a low percentage of MERS-CoV or SARS-CoV patients experienced similar GI distress. Therefore, it is important to test faecal and urine samples to exclude a potential alternative route of transmission, specifically through health care workers, patients etc (<xref rid="fig2" ref-type="fig">Fig. 2</xref>) [<xref rid="bib15" ref-type="bibr">15</xref>,<xref rid="bib16" ref-type="bibr">16</xref>]. Therefore, development of methods to identify the various modes of transmission such as feacal and urine samples are urgently warranted in order to develop strategies to inhibit and/or minimize transmission and to develop therapeutics to control the disease.</p></sec><sec id="sec3"><label>3</label><title>Pathogenesis</title><p id="p0055">The severe symptoms of COVID-19 are associated with an increasing numbers and rate of fatalities specially in the epidemic region of China. On January 22, 2020, the China National Health Commission reported the details of the first 17 deaths and on January 25, 2020 the death cases increased to 56 deaths [<xref rid="bib8" ref-type="bibr">8</xref>]. The percentage of death among the reported 2684 cases of COVID-19 was approximately 2.84% as of Jan 25, 2020 and the median age of the deaths was 75 (range 48–89) years [<xref rid="bib8" ref-type="bibr">8</xref>].</p><p id="p0060">Patients infected with COVID-19 showed higher leukocyte numbers, abnormal respiratory findings, and increased levels of plasma pro-inflammatory cytokines. One of the COVID-19 case reports showed a patient at 5 days of fever presented with a cough, coarse breathing sounds of both lungs, and a body temperature of 39.0 °C. The patient's sputum showed positive real-time polymerase chain reaction results that confirmed COVID-19 infection [<xref rid="bib14" ref-type="bibr">14</xref>]. The laboratory studies showed leucopenia with leukocyte counts of 2.91 × 10^9 cells/L of which 70.0% were neutrophils. Additionally, a value of 16.16 mg/L of blood C-reactive protein was noted which is above the normal range (0–10 mg/L). High erythrocyte sedimentation rate and D-dimer were also observed [<xref rid="bib14" ref-type="bibr">14</xref>]. The main pathogenesis of COVID-19 infection as a respiratory system targeting virus was severe pneumonia, RNAaemia, combined with the incidence of ground-glass opacities, and acute cardiac injury [<xref rid="bib6" ref-type="bibr">6</xref>]. Significantly high blood levels of cytokines and chemokines were noted in patients with COVID-19 infection that included IL1-β, IL1RA, IL7, IL8, IL9, IL10, basic FGF2, GCSF, GMCSF, IFNγ, IP10, MCP1, MIP1α, MIP1β, PDGFB, TNFα, and VEGFA. Some of the severe cases that were admitted to the intensive care unit showed high levels of pro-inflammatory cytokines including IL2, IL7, IL10, GCSF, IP10, MCP1, MIP1α, and TNFα that are reasoned to promote disease severity [<xref rid="bib6" ref-type="bibr">6</xref>].</p></sec><sec id="sec4"><label>4</label><title>Transmission</title><p id="p0065">Based on the large number of infected people that were exposed to the wet animal market in Wuhan City where live animals are routinely sold, it is suggested that this is the likely zoonotic origin of the COVID-19. Efforts have been made to search for a reservoir host or intermediate carriers from which the infection may have spread to humans. Initial reports identified two species of snakes that could be a possible reservoir of the COVID-19. However, to date, there has been no consistent evidence of coronavirus reservoirs other than mammals and birds [<xref rid="bib10" ref-type="bibr">10</xref>,<xref rid="bib18" ref-type="bibr">18</xref>]. Genomic sequence analysis of COVID-19 showed 88% identity with two bat-derived severe acute respiratory syndrome (SARS)-like coronaviruses [<xref rid="bib19" ref-type="bibr">19</xref>,<xref rid="bib20" ref-type="bibr">20</xref>], indicating that mammals are the most likely link between COVID-19 and humans. Several reports have suggested that person-to-person transmission is a likely route for spreading COVID-19 infection. This is supported by cases that occurred within families and among people who did not visit the wet animal market in Wuhan [<xref rid="bib13" ref-type="bibr">13</xref>,<xref rid="bib21" ref-type="bibr">21</xref>]. Person-to-person transmission occurs primarily via direct contact or through droplets spread by coughing or sneezing from an infected individual. In a small study conducted on women in their third trimester who were confirmed to be infected with the coronavirus, there was no evidence that there is transmission from mother to child. However, all pregnant mothers underwent cesarean sections, so it remains unclear whether transmission can occur during vaginal birth. This is important because pregnant mothers are relatively more susceptible to infection by respiratory pathogens and severe pneumonia (<ext-link ext-link-type="uri" xlink:href="https://www.thelancet.com" id="intref0035">https://www.thelancet.com</ext-link>, DOI:<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.1016/S0140-6736(20)30360-3" id="intref0035q">https://doi.org/10.1016/S0140-6736(20)30360-3</ext-link>).</p><p id="p0070">The binding of a receptor expressed by host cells is the first step of viral infection followed by fusion with the cell membrane. It is reasoned that the lung epithelial cells are the primary target of the virus. Thus, it has been reported that human-to-human transmissions of SARS-CoV occurs by the binding between the receptor-binding domain of virus spikes and the cellular receptor which has been identified as angiotensin-converting enzyme 2 (ACE2) receptor [<xref rid="bib20" ref-type="bibr">20</xref>,<xref rid="bib22" ref-type="bibr">22</xref>]. Importantly, the sequence of the receptor-binding domain of COVID-19 spikes is similar to that of SARS-CoV. This data strongly suggests that entry into the host cells is most likely via the ACE2 receptor [<xref rid="bib20" ref-type="bibr">20</xref>].</p></sec><sec id="sec5"><label>5</label><title>Phylogenetic analysis</title><p id="p0075">World Health Organisation (WHO) has classified COVID-19 as a β CoV of group 2B [<xref rid="bib23" ref-type="bibr">23</xref>]. Ten genome sequences of COVID-19 obtained from a total of nine patients exhibited 99.98% sequence identity [<xref rid="bib19" ref-type="bibr">19</xref>]. Another study showed there was 99.8–99.9% nucleotide identity in isolates from five patients and the sequence results revealed the presence of a new beta-CoV strain [<xref rid="bib5" ref-type="bibr">5</xref>]. The genetic sequence of the COVID-19 showed more than 80% identity to SARS-CoV and 50% to the MERS-CoV [<xref rid="bib5" ref-type="bibr">5</xref>,<xref rid="bib19" ref-type="bibr">19</xref>], and both SARS-CoV and MERS-CoV originate in bats [<xref rid="bib24" ref-type="bibr">24</xref>]. Thus, the evidence from the phylogenetic analysis indicates that the COVID-19 belongs to the genus betacoronavirus, which includes SARS-CoV, that infects humans, bats, and wild animals [<xref rid="bib25" ref-type="bibr">25</xref>].</p><p id="p0080">COVID-19 represents the seventh member of the coronavirus family that infects humans and has been classified under the orthocoronavirinae subfamily. The COVID-19 forms a clade within the subgenus sarbecovirus [<xref rid="bib25" ref-type="bibr">25</xref>]. Based on the genetic sequence identity and the phylogenetic reports, COVID-19 is sufficiently different from SARS-CoV and it can thus be considered as a new betacoronavirus that infects humans. The COVID-19 most likely developed from bat origin coronaviruses. Another piece of evidence that supports the COVID-19 is of bat origin is the existence of a high degree of homology of the ACE2 receptor from a diversity of animal species, thus implicating these animal species as possible intermediate hosts or animal models for COVID-19 infections [<xref rid="bib20" ref-type="bibr">20</xref>]. Moreover, these viruses have a single intact open reading frame on gene 8, which is a further indicator of bat-origin CoVs. However, the amino acid sequence of the tentative receptor-binding domain resembles that of SARS-CoV, indicating that these viruses might use the same receptor [<xref rid="bib5" ref-type="bibr">5</xref>].</p></sec><sec id="sec6"><label>6</label><title>Therapeutics/treatment options</title><p id="p0085">The person-to-person transmission of COVID-19 infection led to the isolation of patients that were administered a variety of treatments. At present, there are no specific antiviral drugs or vaccine against COVID-19 infection for potential therapy of humans. The only option available is using broad-spectrum antiviral drugs like Nucleoside analogues and also HIV-protease inhibitors that could attenuate virus infection until the specific antiviral becomes available [<xref rid="bib7" ref-type="bibr">7</xref>]. The treatment that have so far been attempted showed that 75 patients were administrated existing antiviral drugs. The course of treatment included twice a day oral administration of 75 mg oseltamivir, 500 mg lopinavir, 500 mg ritonavir and the intravenous administration of 0·25 g ganciclovir for 3–14 days [<xref rid="bib26" ref-type="bibr">26</xref>]. Another report showed that the broad-spectrum antiviral remdesivir and chloroquine are highly effective in the control of 2019-nCoV infection in vitro. These antiviral compounds have been used in human patients with a safety track record. Thus, these therapeutic agents can be considered to treat COVID-19 infection [<xref rid="bib27" ref-type="bibr">27</xref>]. Furthermore, there are a number of other compounds that are in development. These include the clinical candidate EIDD-2801 compound that has shown high therapeutic potential aganist seasonal and pandemic influenza virus infections and this represents another potential drug to be considered for the treatment of COVID-19 infection [<xref rid="bib28" ref-type="bibr">28</xref>]. Along those lines, until more specific therapeutics become available, it is reasonable to consider more broad-spectrum antivirals that provide drug treatment options for COVID-19 infection include Lopinavir/Ritonavir, Neuraminidase inhibitors, peptide (EK1), RNA synthesis inhibitors. It is clear however, that more research is urgently needed to identify novel chemotherapeutic drugs for treating COVID-19 infections. In order to develop pre-and post-exposure prophylaxis against COVID-19, there is an urgent need to establish an animal model to replicate the severe disease currently observed in humans. Several groups of scientists are currently working hard to develop a nonhuman primate model to study COVID-19 infection to establish fast track novel therapeutics and for the testing of potential vaccines in addition to providing a better understanding of virus-host interactions.</p></sec><sec id="sec7"><label>7</label><title>Future directions to control the spread of the disease</title><p id="p0090">Extensive measures to reduce person-to-person transmission of COVID-19 are required to control the current outbreak. Special attention and efforts to protect or reduce transmission should be applied in susceptible populations including children, health care providers, and elderly people. A guideline was published for the medical staff, healthcare providers, and, public health individuals and researchers who are interested in the 2019-nCoV [<xref rid="bib29" ref-type="bibr">29</xref>]. The early death cases of COVID-19 outbreak occurred primarily in elderly people, possibly due to a weak immune system that permits faster progression of viral infection [<xref rid="bib8" ref-type="bibr">8</xref>,<xref rid="bib12" ref-type="bibr">12</xref>]. The public services and facilities should provide decontaminating reagents for cleaning hands on a routine basis. Physical contact with wet and contaminated objects should be considered in dealing with the virus, especially agents such as faecal and urine samples that can potentially serve as an alternative route of transmission [<xref rid="bib15" ref-type="bibr">15</xref>,<xref rid="bib16" ref-type="bibr">16</xref>]. China and other countries including the US have implemented major prevention and control measures including travel screenings to control further spread of the virus [<xref rid="bib13" ref-type="bibr">13</xref>]. Epidemiological changes in COVID-19 infection should be monitored taking into account potential routes of transmission and subclinical infections, in addition to the adaptation, evolution, and virus spread among humans and possible intermediate animals and reservoirs. There remains a considerable number of questions that need to be addressed. These include, but are not limited to, details about who and how many have been tested, what proportion of these turned positive and whether this rate remains constant or variable. Very few paediatric cases have so far been reported; is this due to lack of testing or a true lack of infection/susceptibility? Of the ones that have so far been tested, how many have developed severe disease and how many were tested positive but showed no clinical sign of disease? There are some basic questions that would provide a framework for which more specific and detailed public health measures can be implemented.</p></sec><sec sec-type="COI-statement"><title>Declaration of competing interest</title><p id="p0095">The authors declare no conflicts of interest.</p></sec></body><back><ref-list id="cebib0010"><title>References</title><ref id="bib1"><label>1</label><element-citation publication-type="journal" id="sref1"><person-group person-group-type="author"><name><surname>Bogoch</surname></name><name><surname>Watts</surname><given-names>A.</given-names></name><name><surname>Thomas-Bachli</surname><given-names>A.</given-names></name><name><surname>Huber</surname><given-names>C.</given-names></name><name><surname>Kraemer</surname><given-names>M.U.G.</given-names></name><name><surname>Khan</surname><given-names>K.</given-names></name></person-group><article-title>Pneumonia of unknown etiology in wuhan, China: potential for international spread via commercial air travel</article-title><source>J. 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Res.</source><volume>7</volume><year>2020</year><fpage>4</fpage><pub-id pub-id-type="pmid">32029004</pub-id></element-citation></ref></ref-list><ack id="ack0010"><title>Acknowledgements</title><p>This work is partially supported by National Institute of Allergy and Infectious Diseases Grant R01 AI129745 to SNB. We thank Ms. Michellie Thurman for editorial help.</p></ack></back></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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