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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Current and Future Considerations for the Treatment of Hospital-Acquired Pneumonia</title><author><name sortKey="Montravers, Philippe" sort="Montravers, Philippe" uniqKey="Montravers P" first="Philippe" last="Montravers">Philippe Montravers</name><affiliation><nlm:aff id="Aff1">Département d’Anesthésie-Réanimation, CHU Bichat Claude-Bernard–HUPNVS, Assistance Publique-Hôpitaux de Paris, University Denis Diderot, PRESS Sorbonne Cité, 46 Rue Henri-Huchard, 75018 Paris, France</nlm:aff></affiliation><affiliation><nlm:aff id="Aff2">University Denis Diderot, PRESS Sorbonne Cité, Paris, France</nlm:aff></affiliation></author><author><name sortKey="Harpan, Adela" sort="Harpan, Adela" uniqKey="Harpan A" first="Adela" last="Harpan">Adela Harpan</name><affiliation><nlm:aff id="Aff1">Département d’Anesthésie-Réanimation, CHU Bichat Claude-Bernard–HUPNVS, Assistance Publique-Hôpitaux de Paris, University Denis Diderot, PRESS Sorbonne Cité, 46 Rue Henri-Huchard, 75018 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Guivarch, Elise" sort="Guivarch, Elise" uniqKey="Guivarch E" first="Elise" last="Guivarch">Elise Guivarch</name><affiliation><nlm:aff id="Aff1">Département d’Anesthésie-Réanimation, CHU Bichat Claude-Bernard–HUPNVS, Assistance Publique-Hôpitaux de Paris, University Denis Diderot, PRESS Sorbonne Cité, 46 Rue Henri-Huchard, 75018 Paris, France</nlm:aff></affiliation><affiliation><nlm:aff id="Aff2">University Denis Diderot, PRESS Sorbonne Cité, Paris, France</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26861846</idno><idno type="pmc">4769724</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4769724</idno><idno type="RBID">PMC:4769724</idno><idno type="doi">10.1007/s12325-016-0293-x</idno><date when="2016">2016</date><idno type="wicri:Area/Pmc/Corpus">000194</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Current and Future Considerations for the Treatment of Hospital-Acquired Pneumonia</title><author><name sortKey="Montravers, Philippe" sort="Montravers, Philippe" uniqKey="Montravers P" first="Philippe" last="Montravers">Philippe Montravers</name><affiliation><nlm:aff id="Aff1">Département d’Anesthésie-Réanimation, CHU Bichat Claude-Bernard–HUPNVS, Assistance Publique-Hôpitaux de Paris, University Denis Diderot, PRESS Sorbonne Cité, 46 Rue Henri-Huchard, 75018 Paris, France</nlm:aff></affiliation><affiliation><nlm:aff id="Aff2">University Denis Diderot, PRESS Sorbonne Cité, Paris, France</nlm:aff></affiliation></author><author><name sortKey="Harpan, Adela" sort="Harpan, Adela" uniqKey="Harpan A" first="Adela" last="Harpan">Adela Harpan</name><affiliation><nlm:aff id="Aff1">Département d’Anesthésie-Réanimation, CHU Bichat Claude-Bernard–HUPNVS, Assistance Publique-Hôpitaux de Paris, University Denis Diderot, PRESS Sorbonne Cité, 46 Rue Henri-Huchard, 75018 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Guivarch, Elise" sort="Guivarch, Elise" uniqKey="Guivarch E" first="Elise" last="Guivarch">Elise Guivarch</name><affiliation><nlm:aff id="Aff1">Département d’Anesthésie-Réanimation, CHU Bichat Claude-Bernard–HUPNVS, Assistance Publique-Hôpitaux de Paris, University Denis Diderot, PRESS Sorbonne Cité, 46 Rue Henri-Huchard, 75018 Paris, France</nlm:aff></affiliation><affiliation><nlm:aff id="Aff2">University Denis Diderot, PRESS Sorbonne Cité, Paris, France</nlm:aff></affiliation></author></analytic><series><title level="j">Advances in Therapy</title><idno type="ISSN">0741-238X</idno><idno type="eISSN">1865-8652</idno><imprint><date when="2016">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Abstract</title><p>Hospital-acquired pneumonia (HAP) and health-care-associated pneumonia (HCAP) are leading causes of death, morbidity, and resource utilization in hospitalized patients, and are associated with a broad range of Gram-positive and Gram-negative pathogens. Here, we discuss the different definitions of HAP and HCAP, review current guidelines regarding the treatment of these conditions, highlight the shortcomings of current therapeutic options, and discuss new antibiotic treatments. To optimize therapeutic outcomes in patients with HAP/HCAP, initial antimicrobial treatment must be appropriate and should be given as soon as possible; inappropriate or delayed therapy greatly increases morbidity and mortality. Selection of the most appropriate antimicrobial agent depends on the causative pathogen(s); initial broad-spectrum therapy is commonly recommended and should cover all pathogens that may be present. Treatment selection should also take into consideration the following factors: knowledge of underlying local risk factors for antimicrobial resistance, disease staging, and risk factors related to specific pathogens such as <italic>Pseudomonas aeruginosa</italic>, <italic>Acinetobacter</italic> spp., and methicillin-resistant <italic>Staphylococcus aureus</italic> (MRSA). Guidelines consistently emphasize the importance of treating HAP and HCAP with early and appropriate broad-spectrum antibiotics, and recent developments in this field have resulted in the availability of several additional treatment options. Telavancin shows potent activity against Gram-positive bacteria including MRSA and can be administered once daily; it was approved in the USA and European Union for the treatment of HAP after demonstrating non-inferiority to vancomycin. Ceftobiprole medocaril exhibits rapid antimicrobial activity against a broad range of both Gram-positive and Gram-negative pathogens, including MRSA. It was approved for the treatment of HAP (excluding ventilator-associated pneumonia) and community-acquired pneumonia in Europe in 2013. These new treatments may offer effective alternative therapeutic options for the management of HAP.</p></sec><sec><title>Funding</title><p>Basilea Pharmaceutica Ltd., Basel, Switzerland.</p></sec><sec><title>Electronic supplementary material</title><p>The online version of this article (doi:10.1007/s12325-016-0293-x) contains supplementary material, which is available to authorized users.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Chawla, R" uniqKey="Chawla R">R Chawla</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Montravers, P" uniqKey="Montravers P">P Montravers</name></author><author><name sortKey="Veber, B" uniqKey="Veber B">B Veber</name></author><author><name sortKey="Auboyer, C" uniqKey="Auboyer C">C Auboyer</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kollef, Mh" uniqKey="Kollef M">MH 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Adv Ther</journal-id><journal-id journal-id-type="iso-abbrev">Adv Ther</journal-id><journal-title-group><journal-title>Advances in Therapy</journal-title></journal-title-group><issn pub-type="ppub">0741-238X</issn><issn pub-type="epub">1865-8652</issn><publisher><publisher-name>Springer Healthcare</publisher-name><publisher-loc>Cheshire</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">26861846</article-id><article-id pub-id-type="pmc">4769724</article-id><article-id pub-id-type="publisher-id">293</article-id><article-id pub-id-type="doi">10.1007/s12325-016-0293-x</article-id><article-categories><subj-group subj-group-type="heading"><subject>Review</subject></subj-group></article-categories><title-group><article-title>Current and Future Considerations for the Treatment of Hospital-Acquired Pneumonia</article-title></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name><surname>Montravers</surname><given-names>Philippe</given-names></name><address><email>philippe.montravers@aphp.fr</email></address><xref ref-type="aff" rid="Aff1"></xref><xref ref-type="aff" rid="Aff2"></xref></contrib><contrib contrib-type="author"><name><surname>Harpan</surname><given-names>Adela</given-names></name><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Guivarch</surname><given-names>Elise</given-names></name><xref ref-type="aff" rid="Aff1"></xref><xref ref-type="aff" rid="Aff2"></xref></contrib><aff id="Aff1"><label></label>Département d’Anesthésie-Réanimation, CHU Bichat Claude-Bernard–HUPNVS, Assistance Publique-Hôpitaux de Paris, University Denis Diderot, PRESS Sorbonne Cité, 46 Rue Henri-Huchard, 75018 Paris, France</aff><aff id="Aff2"><label></label>University Denis Diderot, PRESS Sorbonne Cité, Paris, France</aff></contrib-group><pub-date pub-type="epub"><day>9</day><month>2</month><year>2016</year></pub-date><pub-date pub-type="pmc-release"><day>9</day><month>2</month><year>2016</year></pub-date><pub-date pub-type="ppub"><year>2016</year></pub-date><volume>33</volume><fpage>151</fpage><lpage>166</lpage><history><date date-type="received"><day>4</day><month>1</month><year>2016</year></date></history><permissions><copyright-statement>© The Author(s) 2016</copyright-statement></permissions><abstract id="Abs1"><sec><title>Abstract</title><p>Hospital-acquired pneumonia (HAP) and health-care-associated pneumonia (HCAP) are leading causes of death, morbidity, and resource utilization in hospitalized patients, and are associated with a broad range of Gram-positive and Gram-negative pathogens. Here, we discuss the different definitions of HAP and HCAP, review current guidelines regarding the treatment of these conditions, highlight the shortcomings of current therapeutic options, and discuss new antibiotic treatments. To optimize therapeutic outcomes in patients with HAP/HCAP, initial antimicrobial treatment must be appropriate and should be given as soon as possible; inappropriate or delayed therapy greatly increases morbidity and mortality. Selection of the most appropriate antimicrobial agent depends on the causative pathogen(s); initial broad-spectrum therapy is commonly recommended and should cover all pathogens that may be present. Treatment selection should also take into consideration the following factors: knowledge of underlying local risk factors for antimicrobial resistance, disease staging, and risk factors related to specific pathogens such as <italic>Pseudomonas aeruginosa</italic>, <italic>Acinetobacter</italic> spp., and methicillin-resistant <italic>Staphylococcus aureus</italic> (MRSA). Guidelines consistently emphasize the importance of treating HAP and HCAP with early and appropriate broad-spectrum antibiotics, and recent developments in this field have resulted in the availability of several additional treatment options. Telavancin shows potent activity against Gram-positive bacteria including MRSA and can be administered once daily; it was approved in the USA and European Union for the treatment of HAP after demonstrating non-inferiority to vancomycin. Ceftobiprole medocaril exhibits rapid antimicrobial activity against a broad range of both Gram-positive and Gram-negative pathogens, including MRSA. It was approved for the treatment of HAP (excluding ventilator-associated pneumonia) and community-acquired pneumonia in Europe in 2013. These new treatments may offer effective alternative therapeutic options for the management of HAP.</p></sec><sec><title>Funding</title><p>Basilea Pharmaceutica Ltd., Basel, Switzerland.</p></sec><sec><title>Electronic supplementary material</title><p>The online version of this article (doi:10.1007/s12325-016-0293-x) contains supplementary material, which is available to authorized users.</p></sec></abstract><kwd-group xml:lang="en"><title>Keywords</title><kwd>Antimicrobial resistance</kwd><kwd>Ceftobiprole</kwd><kwd>Hospital-acquired pneumonia</kwd><kwd>Health-care-associated pneumonia</kwd><kwd>Monotherapy</kwd><kwd>MRSA</kwd><kwd>Multidrug resistance</kwd><kwd><italic>Staphylococcus aureus</italic></kwd><kwd>Tedizolid</kwd><kwd>Telavancin</kwd></kwd-group><funding-group><award-group><funding-source><institution>Basilea</institution></funding-source></award-group></funding-group><custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name><meta-value>© Springer Healthcare 2016</meta-value></custom-meta></custom-meta-group></article-meta></front><body><sec id="Sec1"><title>Introduction</title><p>Hospital-acquired pneumonia (HAP) is one of the most common nosocomial infections, occurring at a rate of 5 to more than 20 cases per 1000 hospital admissions [<xref ref-type="bibr" rid="CR1">1</xref>, <xref ref-type="bibr" rid="CR2">2</xref>], and is a leading cause of death, morbidity, and resource utilization in hospitalized patients [<xref ref-type="bibr" rid="CR2">2</xref>–<xref ref-type="bibr" rid="CR6">6</xref>]. Health-care-associated pneumonia (HCAP) describes pneumonia contracted as a result of contact with health-care settings other than hospitals, such as assisted living centers and rehabilitation facilities. A large, multicenter study in the USA found that >20% of 4543 patients hospitalized with pneumonia had HCAP, with mortality similar to that for HAP (19.8% vs. 18.8%) [<xref ref-type="bibr" rid="CR7">7</xref>].</p><p>This review discusses the different definitions of HAP and HCAP, reviews current guidelines regarding the treatment of patients with these conditions, and highlights the shortcomings of current therapeutic options. Antibiotics recently approved for the treatment of HAP (telavancin and ceftobiprole) together with tedizolid (currently in clinical development) are also discussed; new agents approved for the treatment of ventilator-associated pneumonia (VAP) are not considered here as this is beyond the scope of this review. This article is based on previously conducted studies and does not involve any new studies of human or animal subjects performed by any of the authors.</p></sec><sec id="Sec2"><title>Definitions of HAP and HCAP</title><p>In the USA and Europe, HAP is defined as pneumonia that develops 48 h or more after hospital admission [<xref ref-type="bibr" rid="CR2">2</xref>, <xref ref-type="bibr" rid="CR8">8</xref>, <xref ref-type="bibr" rid="CR9">9</xref>]. HAP is distinct from VAP, which arises more than 48–72 h after endotracheal intubation [<xref ref-type="bibr" rid="CR2">2</xref>]. Many patients with HAP are treated outside the intensive care unit (ICU) and do not require mechanical ventilation [<xref ref-type="bibr" rid="CR10">10</xref>]. HCAP is a more recent term than HAP and its clinical relevance remains disputed. HCAP was recognized in the American Thoracic Society (ATS) 2005 guidelines, which describe a distinct form of pneumonia not contracted during a hospital admission, but which resembles HAP more than community-acquired pneumonia (CAP; see Table <xref rid="Tab1" ref-type="table">1</xref> for a full definition of HCAP) [<xref ref-type="bibr" rid="CR2">2</xref>]. Since the publication of the ATS guidelines there has been continued debate about the clinical relevance of HCAP, and indeed, the term HCAP may not be retained in the forthcoming updated ATS guidelines. Joint European guidelines on the management of HAP, published in 2009 by the European Respiratory Society (ERS), the European Society of Clinical Microbiology and Infectious Diseases (ESCMID), and the European Society of Intensive Care Medicine (ESICM) call for HCAP to be recognized as a distinct disease from CAP, but do not provide a specific definition [<xref ref-type="bibr" rid="CR11">11</xref>]. However, separate guidelines issued by the ERS and ESCMID in 2011 on the management of lower respiratory tract infections (excluding HAP) state that “the evidence base does not support the use of this term [HCAP] as being clinically relevant in Europe at the present time” [<xref ref-type="bibr" rid="CR12">12</xref>]; similar doubts were also raised in the German guidelines published in 2013 [<xref ref-type="bibr" rid="CR9">9</xref>].<table-wrap id="Tab1"><label>Table 1</label><caption><p>Current guidelines for the treatment of HAP and HCAP</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="2"></th><th align="left" rowspan="2">General considerations</th><th align="left" colspan="2">Treatment considerations</th><th align="left" rowspan="2">De-escalation</th></tr><tr><th align="left">Patients with no risk factors for MDR pathogens</th><th align="left">Patients with risk factors for MDR pathogens</th></tr></thead><tbody><tr><td align="left">USA (ATS) [<xref ref-type="bibr" rid="CR2">2</xref>]</td><td align="left">Antibiotic selection for each patient should be based on risk factors for MDR pathogens<break></break>Initial empirical therapy recommendations can be modified based on local pathogen spectrum and resistance profiles</td><td align="left">Early-onset HAP (<5 days after hospital admission)<break></break> Potential pathogens include <italic>S.</italic> <italic>pneumoniae</italic>, <italic>H.</italic> <italic>influenzae</italic>, MSSA, antibiotic-sensitive enteric Gram-negative bacilli, <italic>E.</italic> <italic>coli</italic>, <italic>K.</italic> <italic>pneumoniae</italic>, <italic>Enterobacter</italic> spp., <italic>Proteus</italic> spp., <italic>Serratia</italic> <italic>marcescens</italic><break></break>Ceftriaxone or levofloxacin/moxifloxacin/ciprofloxacin or ampicillin/sulbactam or ertapenem</td><td align="left">Late-onset HAP (≥5 days after hospital admission) and all HCAP<break></break> Risk factors (HAP and HCAP) include antimicrobial therapy in the previous 90 days, current hospitalization of ≥5 days, high prevalence of MDR pathogens, immunosuppression<break></break> Risk factors (HCAP only) are hospitalization for 2 days or more in the preceding 90 days, residence in a nursing home or extended care facility, home infusion therapy (including antibiotics), chronic dialysis in the previous 30 days, home wound care, family member with an MDR pathogen<break></break> Potential pathogens include <italic>P.</italic> <italic>aeruginosa</italic>, <italic>K.</italic> <italic>pneumoniae</italic> (ESBL+), <italic>Acinetobacter</italic> spp., MRSA, <italic>Legionella pneumophila</italic><break></break> Antipseudomonal therapies: cephalosporins (cefepime, ceftazidime) or carbapenems (imipenem, meropenem) or piperacillin/tazobactam plus ciprofloxacin, levofloxacin or aminoglycosides (amikacin, gentamicin, tobramycin)<break></break>MRSA: add linezolid or vancomycin<break></break>If <italic>L.</italic> <italic>pneumophila</italic> is suspected, the combination regimen should include a macrolide (e.g., azithromycin) or a fluoroquinolone should be used rather than an aminoglycoside</td><td align="left">Therapy should be focused or narrowed as soon as the causative pathogen is identified<break></break>If an appropriate initial antibiotic regimen is received, therapy duration should be shortened to 7 days (from the traditional 14–21 days)</td></tr><tr><td align="left">European (joint guidelines from ERS, ESCMID, and ESICM) [<xref ref-type="bibr" rid="CR11">11</xref>]</td><td align="left">Initial empirical therapy should take local resistance patterns into consideration<break></break>Adequate initial empirical treatment depends on the identification of essential risk factors for the pathogen and resistance profiles<break></break>Suboptimal dosing is a major risk factor for the development of resistance</td><td align="left">Early-onset HAP (onset ≤4 days after hospital admission)<break></break> Principal pathogens include <italic>S. aureus, S. pneumoniae, H. influenza</italic>, non-drug-resistant GNEB<break></break> Aminopenicillin plus β-lactamase inhibitor or respiratory quinolone (not ciprofloxacin) or second- or third-generation cephalosporin</td><td align="left">Late-onset HAP (onset >4 days after hospital admission)<break></break> Principal pathogens include MRSA, drug-resistant GNEB, <italic>P. aeruginosa, A.</italic> <italic>baumannii</italic>, other drug-resistant pathogens<break></break> Piperacillin/tazobactam or ceftazidime or imipenem/cilistatin or meropenem plus ciprofloxacin or levofloxacin<break></break>If MRSA is suspected, add vancomycin or linezolid<break></break>Other risk factors (any onset) include age, lung disease, previous antimicrobial treatment, previous tracheobronchial colonization, pneumonia severity<break></break> Principal pathogens include MRSA, <italic>P. aeruginosa, Acinetobacter</italic> spp., <italic>Legionella</italic> spp.<break></break> For MRSA: vancomycin or linezolid<break></break> For <italic>P. aeruginosa</italic>: piperacillin/tazobactam or ceftazidime or imipenem/cilastatin or meropenem plus ciprofloxacin or levofloxacin<break></break> For <italic>Acinetobacter</italic> spp.: imipenem/cilastatin or meropenem or ampicillin/sulbactam (plus tigecycline loading dose)<break></break> For <italic>Legionella</italic> spp.: respiratory quinolone (not ciprofloxacin)</td><td align="left">Therapy should be focused or narrowed as soon as the causative pathogen is identified<break></break>Treatment should be switched to monotherapy after 3–5 days</td></tr><tr><td align="left">Germany (Association of Scientific Medical Societies in Germany<sup>a</sup>) [<xref ref-type="bibr" rid="CR9">9</xref>]</td><td align="left">Patients with risk factors for MDR pathogens must be distinguished from those without such factors before initiating treatment<break></break>Knowledge of the regional/local spectrum of pathogens and resistance profiles is critical; institutions treating patients with HAP should regularly collect and analyze these data</td><td align="left">Hospital stay ≤4 days<break></break> Principal pathogens: <italic>E.</italic> <italic>coli, Klebsiella</italic> spp.<italic>, Enterobacter</italic> spp<italic>., H.</italic> <italic>influenza,</italic> MSSA, <italic>S.</italic> <italic>pneumoniae</italic><break></break> Aminopenicllin/β-lactamase inhibitor (ampicillin/sulbactam, amoxicillin/clavulanic acid) or group 3a cephalosporin (ceftriaxone, cefotaxime) or carbapenem (ertapenem) or fluoroquinolone (moxifloxacin, levofloxacin)</td><td align="left">Risk factors include previous antimicrobial therapy, hospital stay >4 days, invasive ventilation >4 to 6 days, care in the ICU, malnutrition, structural lung disease, known colonization by MDR pathogens, admission from long-term care, chronic dialysis<break></break> Principal pathogens include MRSA, ESBL-forming <italic>Enterobacteriaceae, P.</italic> <italic>aeruginosa, A.</italic> <italic>baumannii, Stentrophomonas maltophilia</italic><break></break> β-lactam drugs against <italic>Pseudomonas</italic> spp. (piperacillin/tazobactam or cephalosporin (cefepime, ceftazidime) or carbapenem (imipenem/cilastatin, meropenem, doripenem) plus fluoroquinolone (ciprofloxacin, levofloxacin) or aminoglycoside (gentamicin, tobramycin, amikacin)<break></break> For MRSA: vancomycin or linezolid plus a glycopeptide or oxazolidinone</td><td align="left">Patients should be re-evaluated after 2–3 days<break></break>If a specific pathogen has been identified, de-escalate treatment to targeted monotherapy<break></break>If no pathogen has been identified, but clinical improvement/treatment success is observed, de-escalate, usually to β-lactam monotherapy</td></tr><tr><td align="left">UK (BSAC, NICE) [<xref ref-type="bibr" rid="CR8">8</xref>, <xref ref-type="bibr" rid="CR30">30</xref>]</td><td align="left">Offer antibiotic therapy as soon as possible after diagnosis, and certainly within 4 h<break></break>Choose antibiotic therapy based on clinical circumstances, local guidelines, and hospital policy (which should take into account the knowledge of local microbial pathogens)<break></break>Consider a 5- to 10-day course of antibiotic therapy</td><td align="left">Early-onset pneumonia (onset <5 days after hospital admission)<break></break> Co-amoxiclav or cefuroxime<break></break> For <italic>P. aeruginosa</italic>:<sup>b</sup> ceftazidime or ciprofloxacin or meropenem or piperacillin/tazobactam<break></break> No specific recommendation for MRSA</td><td align="left">Early-onset pneumonia in patients who have recently received antibiotics and/or have other risk factors<break></break> Third-generation cephalosporin (cefotaxime, ceftriaxone) or fluoroquinolone or piperacillin/tazobactam<break></break> For <italic>P. aeruginosa</italic>:<sup>b</sup> ceftazidime or ciprofloxacin or meropenem or piperacillin/tazobactam<break></break> No specific recommendation for MRSA</td><td align="left"></td></tr></tbody></table><table-wrap-foot><p><italic>ATS</italic> American Thoracic Society, <italic>BSAC</italic> British Society for Antimicrobial Chemotherapy, <italic>CAP</italic> community-acquired pneumonia, <italic>ERS</italic> European Respiratory Society, <italic>ESBL</italic> extended-spectrum β-lactamase, <italic>ESCMID</italic> European Society for Clinical Microbiology and Infectious Diseases, <italic>ESICM</italic> European Society of Intensive Care Medicine, <italic>GNEB</italic> Gram-negative <italic>Enterobacteriaceae</italic>, <italic>HAP</italic> hospital-acquired pneumonia, <italic>HCAP</italic> health-care-associated pneumonia, <italic>ICU</italic> intensive care unit, <italic>MDR</italic> multidrug resistant, <italic>MRSA</italic> methicillin-resistant <italic>Staphylococcus aureus</italic>, <italic>MSSA</italic> methicillin-susceptible <italic>S. aureus</italic>, <italic>NICE</italic> National Institute for Health and Care Excellence</p><p><sup>a</sup>German Society of Anaesthesiology and Intensive Care Medicine, German Society of Infectious Diseases, German Society for Hygiene and Microbiology, German Respiratory Society, Paul Ehrlich Society for Chemotherapy, German Surgical Society, German Society of Internal Medicine, German Society of Internal Intensive Care and Emergency Medicine, German Sepsis Society, Robert Koch Institute</p><p><sup>b</sup>Guidelines do not state whether or not these treatments apply to patients with HAP who present with risk factors [<xref ref-type="bibr" rid="CR30">30</xref>]</p></table-wrap-foot></table-wrap></p><p>Interestingly, the definition of HCAP used in clinical studies varies greatly, particularly regarding the length of time since previous hospital stay, the definition of and exposure to health-care facilities, and the inclusion/exclusion of immunocompromised patients [<xref ref-type="bibr" rid="CR7">7</xref>, <xref ref-type="bibr" rid="CR13">13</xref>, <xref ref-type="bibr" rid="CR14">14</xref>]. The heterogeneity of the studies of patients with HCAP may contribute to the uncertainty surrounding the acceptance of HCAP as a distinct subgroup of pneumonia.</p></sec><sec id="Sec3"><title>Risk Factors, Etiology, and Diagnosis of HAP and HCAP</title><p>Individuals at the greatest risk of HAP include elderly people, patients who are immunocompromised or malnourished, patients with depression of consciousness, chronic renal failure, or multiple comorbidities (e.g., Charlson comorbidity index ≥3), or those who have undergone surgery [<xref ref-type="bibr" rid="CR2">2</xref>, <xref ref-type="bibr" rid="CR10">10</xref>]; increased length of hospital stay is also associated with a higher risk of developing HAP. Similar risk factors are documented for HCAP [<xref ref-type="bibr" rid="CR7">7</xref>, <xref ref-type="bibr" rid="CR15">15</xref>].</p><p>Etiologies of HAP and HCAP vary according to geographic area and risk factors. HAP typically involves infection with a single pathogen, such as a member of the <italic>Enterobacteriaceae</italic> (e.g., <italic>Klebsiella</italic> spp., <italic>Enterobacter</italic> spp., and <italic>Serratia</italic> spp.), <italic>Staphylococcus aureus</italic> (including methicillin-resistant <italic>S.</italic><italic>aureus</italic> [MRSA]), <italic>Pseudomonas aeruginosa</italic>, or <italic>Acinetobacter baumannii</italic> [<xref ref-type="bibr" rid="CR11">11</xref>, <xref ref-type="bibr" rid="CR16">16</xref>, <xref ref-type="bibr" rid="CR17">17</xref>]. HCAP is typically associated with pathogens such as <italic>Streptococcus pneumoniae, Klebsiella pneumoniae</italic>, and <italic>S.</italic> <italic>aureus</italic> [<xref ref-type="bibr" rid="CR14">14</xref>, <xref ref-type="bibr" rid="CR18">18</xref>, <xref ref-type="bibr" rid="CR19">19</xref>].</p><p>Questions remain regarding some of the characteristics of HCAP [<xref ref-type="bibr" rid="CR20">20</xref>], such as its association with a high frequency of multidrug-resistant (MDR) pathogens [<xref ref-type="bibr" rid="CR21">21</xref>–<xref ref-type="bibr" rid="CR24">24</xref>] and the assumption that antibiotic treatment for CAP would be insufficient for patients with HCAP [<xref ref-type="bibr" rid="CR21">21</xref>]. Indeed, several studies have found a greater prevalence of hard-to-treat or MDR pathogens in patients with HCAP than in those with CAP [<xref ref-type="bibr" rid="CR7">7</xref>, <xref ref-type="bibr" rid="CR25">25</xref>, <xref ref-type="bibr" rid="CR26">26</xref>]. A study of 4543 patients in the USA found that 18.3% and 16.8% of patients with HCAP and HAP, respectively, were infected with MRSA, compared with 6.2% of those with CAP [<xref ref-type="bibr" rid="CR7">7</xref>]. Furthermore, a study in 727 patients in Spain reported that penicillin-resistant pneumococcal strains were more commonly isolated from patients with HCAP than from those with CAP (33.3% vs. 14.9%). In contrast, a low incidence of MDR pathogens was observed in both patients with HCAP and those with CAP in a separate study in Spain [<xref ref-type="bibr" rid="CR22">22</xref>] and in a small UK study (<italic>n</italic> = 138) [<xref ref-type="bibr" rid="CR23">23</xref>].</p><p>Rapid identification of the specific causative pathogen(s) in patients with HAP and HCAP is essential to ensure that patients receive the most appropriate treatment as soon as possible. The identification of specific pathogens is challenging. The results of bacteriological assays are not always consistent and reproducible, and inaccurate cultures can result in failure to treat the relevant pathogens [<xref ref-type="bibr" rid="CR2">2</xref>]. Moreover, invasive techniques for microbiological analysis are often difficult to perform on nonventilated individuals, and patients may be considered too ill for the procedure. In addition, specialized laboratories and training are required for many procedures and bronchoscopy may not be immediately available [<xref ref-type="bibr" rid="CR2">2</xref>, <xref ref-type="bibr" rid="CR27">27</xref>].</p></sec><sec id="Sec4"><title>Treatment of HAP and HCAP: Current Guidelines and Considerations</title><p>The initial approach to the treatment of patients with HAP and HCAP is often necessarily empirical because complete results of antimicrobial susceptibility testing of the causative pathogens are typically available only after 48–72 h. Appropriate empirical therapy should not be delayed, because inadequate and delayed treatment is associated with increased morbidity and mortality [<xref ref-type="bibr" rid="CR28">28</xref>, <xref ref-type="bibr" rid="CR29">29</xref>]. Successful antimicrobial treatment depends on the use of an agent or regimen that is effective against the causative pathogen(s), and broad-spectrum therapy is often recommended [<xref ref-type="bibr" rid="CR2">2</xref>]. Antimicrobial therapies that act rapidly reduce the length of hospital stays that in turn reduce resource utilization and health-care system costs [<xref ref-type="bibr" rid="CR28">28</xref>].</p><sec id="Sec5"><title>US and European Guidelines</title><p>A summary of key recommendations from the major US and European HAP and HCAP guidelines is provided in Table <xref rid="Tab1" ref-type="table">1</xref> [<xref ref-type="bibr" rid="CR2">2</xref>, <xref ref-type="bibr" rid="CR8">8</xref>, <xref ref-type="bibr" rid="CR9">9</xref>, <xref ref-type="bibr" rid="CR11">11</xref>, <xref ref-type="bibr" rid="CR30">30</xref>]. In the most recent ATS guidelines (2005) [<xref ref-type="bibr" rid="CR2">2</xref>], treatment recommendations for HAP and HCAP are based on whether or not patients have risk factors for MDR pathogens, with more aggressive therapeutic strategies recommended for those who do; notably, all patients with HCAP are classified as being at risk of having MDR pathogens. Approaches to initial therapy provided in individual guidelines from Europe range from disease stage-specific antibiotic interventions to decision-making based on local conditions; however, as with the ATS recommendations, most guidelines categorize treatment strategies according to the risk of the presence of MDR bacteria [<xref ref-type="bibr" rid="CR2">2</xref>, <xref ref-type="bibr" rid="CR30">30</xref>, <xref ref-type="bibr" rid="CR31">31</xref>]. Where this approach is employed, aminopenicillins with β-lactamase inhibitors, second- or third-generation cephalosporins, quinolones, or ertapenem are advocated for patients considered to be at low risk (e.g., early-onset HAP and/or no MDR pathogen risk). For patients thought to be at higher risk (e.g., late-onset HAP, MDR pathogen risk, in the ICU, and/or with organ failure), imipenem, meropenem, fourth-generation cephalosporins, ceftazidime, or piperacillin/tazobactam plus quinolones or aminoglycosides are recommended, depending on the degree of risk [<xref ref-type="bibr" rid="CR32">32</xref>]. When MRSA is implicated in HAP, all guidelines recommend either linezolid or vancomycin (Table <xref rid="Tab1" ref-type="table">1</xref>), but do not state a preference because direct comparisons have shown no difference in overall survival rate (although cure rates are higher with linezolid) [<xref ref-type="bibr" rid="CR33">33</xref>]. It should also be emphasized that the therapeutic response is often poor if <italic>P. aeruginosa</italic> and MRSA are present, and infections with either of these pathogens are difficult to treat even when appropriate initial antibiotic therapy is used [<xref ref-type="bibr" rid="CR34">34</xref>–<xref ref-type="bibr" rid="CR36">36</xref>].</p><p>Joint European guidelines for the management of HAP recommend that treatment is selected according to the timing of disease onset (early onset [≤4 days of hospital admission] or late onset [>4 days of hospital admission]) and whether risk factors are present (any onset) (Table <xref rid="Tab1" ref-type="table">1</xref>) [<xref ref-type="bibr" rid="CR11">11</xref>]. Where risk factors are present, the choice of therapy should reflect the suspected pathogen and take local bacterial spectrums into consideration. Once the pathogen responsible has been identified, therapy should focus on the relevant pathogen(s), and most patients should be switched to monotherapy after 3–5 days [<xref ref-type="bibr" rid="CR11">11</xref>].</p></sec><sec id="Sec6"><title>National and Local Guidelines</title><p>Treatment guidelines at the national level vary from general considerations and broad therapy suggestions to specific recommendations for different patient types and pathogens. Recent national guidelines highlight the importance of considering the spectrum of pathogens in the local area and their resistance profiles. The 2013 German guidelines categorize treatments for HAP based on whether or not patients have risk factors for the presence of MDR pathogens (Table <xref rid="Tab1" ref-type="table">1</xref>) [<xref ref-type="bibr" rid="CR9">9</xref>]. The guidelines advocate continuing treatment for 8 days, with de-escalation 48–72 h after the start of treatment when appropriate [<xref ref-type="bibr" rid="CR9">9</xref>]. In contrast to these specific recommendations, UK guidelines for the management of HAP published in 2008 contain few definitive treatment recommendations (Table <xref rid="Tab1" ref-type="table">1</xref>), citing lack of conclusive clinical evidence [<xref ref-type="bibr" rid="CR30">30</xref>]. In December 2014, the UK National Institute for Health and Care Excellence (NICE) issued updated guidance beyond areas of care for which best practice was already established, recommending (i) the prompt initiation of therapy (certainly within 4 h), (ii) that the choice of therapy should reflect local hospital policy, and (iii) that a 5- to 10-day course of therapy be considered (Table <xref rid="Tab1" ref-type="table">1</xref>) [<xref ref-type="bibr" rid="CR8">8</xref>].</p><p>Further and more detailed guidelines for the treatment of HAP are often issued at regional or local levels and even by individual hospitals [<xref ref-type="bibr" rid="CR37">37</xref>, <xref ref-type="bibr" rid="CR38">38</xref>], although few of these are readily available. Recommendations at the local level tend to reflect differences in the spectrum of pathogens associated with HAP in the particular area. An example of this is the guidance related to MRSA, which has a higher prevalence in southern Europe than in northern Europe [<xref ref-type="bibr" rid="CR39">39</xref>], potentially linked to increased antibiotic use in southern Europe [<xref ref-type="bibr" rid="CR40">40</xref>]. Treatment strategies may also be tailored to local resistance patterns. For example, policies issued by the Royal Devon and Exeter NHS Foundation Trust (south-west UK) recommend vancomycin for all patients with moderate-to-severe HAP who are at high risk of MRSA infection [<xref ref-type="bibr" rid="CR37">37</xref>], while those from Nottingham University Hospitals NHS Trust (central UK) note that nearly all <italic>S.</italic><italic>aureus</italic> strains are sensitive to gentamicin and doxycycline, so linezolid and vancomycin are recommended only for patients in the ICU where there is <italic>known</italic> MRSA colonization [<xref ref-type="bibr" rid="CR38">38</xref>].</p></sec><sec id="Sec7"><title>Further Considerations for Treatment Selection</title><p>Guidelines are important for providing recommendations on which treatments (or classes of treatments) are appropriate for HAP/HCAP, but patient-specific considerations also influence treatment choice. These include duration of hospitalization before development of pneumonia, HAP staging, antimicrobial resistance patterns within the hospital, and previous antibiotic use [<xref ref-type="bibr" rid="CR29">29</xref>]. Patient risk factors such as older age, presence of congestive heart failure, corticosteroid treatment, endotracheal intubation, neutropenia, and septic shock also affect the choice of therapy [<xref ref-type="bibr" rid="CR28">28</xref>]. In addition, many patients with HAP or HCAP have comorbidities such as chronic renal failure that exclude them from receiving certain treatments [<xref ref-type="bibr" rid="CR7">7</xref>, <xref ref-type="bibr" rid="CR41">41</xref>].</p></sec><sec id="Sec8"><title>Therapeutic Failure and De-escalation of Therapy</title><p>Failure to respond to initial empirical antibiotic therapy can be expected in approximately 20–40% of patients with HAP, depending on the causative pathogen, the nature of the infection, and the presence and severity of comorbidities [<xref ref-type="bibr" rid="CR11">11</xref>]. Therapeutic failure requires immediate and extensive diagnostic re-evaluation of the patient, including bronchoscopic respiratory secretion sampling and blood cultures [<xref ref-type="bibr" rid="CR11">11</xref>, <xref ref-type="bibr" rid="CR42">42</xref>]. This should be accompanied by assessment of other complications, alternative diagnoses (e.g., atelectasis, congestive heart failure), and other sites of infection in the patient [<xref ref-type="bibr" rid="CR2">2</xref>].</p><p>Effective de-escalation of broad-spectrum empirical therapy is important if patients’ exposure to antibiotics and treatment resistance are to be minimized. The current European guidelines recommend that de-escalation begins once the pathogen has been identified (usually after 3–5 days; after 2–3 days in Germany) (Table <xref rid="Tab1" ref-type="table">1</xref>) [<xref ref-type="bibr" rid="CR9">9</xref>, <xref ref-type="bibr" rid="CR11">11</xref>]. De-escalation can be conducted in several ways. First, therapy can focus on an antibiotic with a narrower spectrum of activity. In particular, vancomycin and linezolid treatment should be stopped if MRSA is not identified, and very broad-spectrum agents, such as carbapenems, piperacillin–tazobactam, and/or cefepime, should be restricted to patients infected with pathogens susceptible only to these agents [<xref ref-type="bibr" rid="CR11">11</xref>]. Secondly, if the dosage of the initial antibiotic was high (e.g., based on pharmacodynamic optimization), it can be reduced to a standard dosage for a susceptible organism. Thirdly, if no pathogen is identified but clinical improvement has been observed, antibiotic therapy can be reduced (usually, to β-lactam monotherapy) or discontinued altogether [<xref ref-type="bibr" rid="CR9">9</xref>, <xref ref-type="bibr" rid="CR11">11</xref>].</p></sec></sec><sec id="Sec9"><title>New Treatment Options for HAP and HCAP</title><p>The persisting high mortality associated with HAP and HCAP [<xref ref-type="bibr" rid="CR5">5</xref>, <xref ref-type="bibr" rid="CR7">7</xref>] indicates that current treatments are far from optimal. In addition to suboptimal efficacy, factors such as high nephrotoxicity rates (in 15.4% of patients with HAP treated with vancomycin) [<xref ref-type="bibr" rid="CR43">43</xref>] and myelosuppression (associated with linezolid) [<xref ref-type="bibr" rid="CR44">44</xref>] limit the use of certain antimicrobials. In addition, infections involving MRSA, mixed Gram-positive and Gram-negative bacteria, or MDR pathogens cannot currently be treated adequately by any single agent [<xref ref-type="bibr" rid="CR5">5</xref>]. Hence, there remains a need for additional antibiotics that provide well-tolerated, broad-spectrum activity against MDR pathogens. Furthermore, alternative broad-spectrum antibiotics for HAP may offer carbapenem-sparing treatment options and thus help reduce the resistance selection pressure on carbapenems and limit the emergence of carbapenemases. The availability of such treatments would simplify the initial empirical therapy for HAP and HCAP.</p><p>In the ‘golden age’ of antibiotic development between 1935 and 1968, 14 classes of drug were introduced for human use. Since then, only five new classes have been added. Few new therapeutic agents for HAP have been approved recently. The most promising recent approvals include telavancin and ceftobiprole medocaril (Table <xref rid="Tab2" ref-type="table">2</xref>) [<xref ref-type="bibr" rid="CR45">45</xref>, <xref ref-type="bibr" rid="CR46">46</xref>]; tedizolid phosphate is currently being investigated for the treatment of CAP, HAP, VAP, and bacteremia.<table-wrap id="Tab2"><label>Table 2</label><caption><p>HAP treatment options that have recently become available</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left">Treatment</th><th align="left">Countries/regions in which approved</th><th align="left">Current indication<sup>a</sup> (Europe)</th><th align="left">Dosing</th><th align="left">Dose adjustments</th><th align="left">Notes and comments</th></tr></thead><tbody><tr><td align="left">Telavancin [<xref ref-type="bibr" rid="CR45">45</xref>]</td><td align="left">Europe<break></break>USA</td><td align="left">Treatment of adults with nosocomial pneumonia, including VAP, known or suspected to be caused by MRSA<break></break>Use only when it is known or suspected that other alternatives are not suitable</td><td align="left">HAP<break></break>10 mg/kg i.v. once every 24 h, for 7–21 days</td><td align="left">HAP<break></break>Patients with renal impairment<break></break> CL<sub>CR</sub> 30–50 mL/min 7.5 mg/kg every 24 h</td><td align="left">Potent against Gram-positive pathogens (including MRSA, vancomycin-intermediate <italic>S.</italic> <italic>aureus</italic>, and penicillin-resistant <italic>S.</italic> <italic>pneumoniae</italic>)<break></break>Once-daily dosing<break></break>Not effective against Gram-negative bacteria<break></break>Not indicated for patients with severe renal impairment<break></break>Risk of nephrotoxicity: requires constant monitoring of renal function</td></tr><tr><td align="left">Ceftobiprole medocaril [<xref ref-type="bibr" rid="CR46">46</xref>]</td><td align="left">13 European countries (Austria, Belgium, Denmark, Finland, France, Germany, Italy, Luxembourg, Norway, Spain, Sweden, Switzerland, and the UK) and Canada</td><td align="left">Treatment of adults with HAP (excluding VAP) and CAP</td><td align="left">HAP (excluding VAP) and CAP<break></break> 500 mg administered as a 2-h i.v. infusion every 8 h</td><td align="left">HAP (excluding VAP) and CAP<break></break>Patients with renal impairment<break></break> Moderate impairment (CL<sub>CR</sub> 30 to <50 mL/min) 500 mg administered as a 2-h i.v. infusion every 12 h<break></break> Severe impairment (CL<sub>CR</sub> <30 mL/min) 250 mg administered as a 2-h i.v. infusion every 12 h<break></break> Patients with ESRD 250 mg once every 24 h</td><td align="left">Activity against a broad spectrum of Gram-negative and Gram-positive pathogens<break></break>Highly potent activity against MRSA<break></break>Reduced activity against ESBL-producing strains<break></break>Not indicated for VAP<break></break>Dose adjustments required for patients with renal impairment<break></break>Not approved in the USA; the Food and Drug Administration raised Good Clinical Practice concerns in 2008 regarding some ceftobiprole study data, but in a different indication (complicated skin infections)</td></tr></tbody></table><table-wrap-foot><p><italic>CAP</italic> community-acquired pneumonia, <italic>CL</italic><sub><italic>CR</italic></sub> creatinine clearance, <italic>ESBL</italic> extended-spectrum β-lactamase, <italic>ESRD</italic> end-stage renal disease, <italic>HAP</italic> hospital-acquired pneumonia, <italic>i.v.</italic> intravenous, <italic>MRSA</italic> methicillin-resistant <italic>Staphylococcus aureus, VAP</italic> ventilator-associated pneumonia</p><p><sup>a</sup>Consideration should be given to official guidance on the appropriate use of antibacterial agents</p></table-wrap-foot></table-wrap></p><sec id="Sec10"><title>Telavancin</title><p>Telavancin is a semisynthetic lipopolypeptide with approximately tenfold greater potency than vancomycin [<xref ref-type="bibr" rid="CR47">47</xref>] and exclusively displays in vitro activity against clinically important Gram-positive bacteria including MRSA, vancomycin-intermediate <italic>S.</italic> <italic>aureus</italic>, and penicillin-resistant <italic>S.</italic> <italic>pneumoniae</italic> [<xref ref-type="bibr" rid="CR47">47</xref>–<xref ref-type="bibr" rid="CR50">50</xref>]. Bactericidal activity is concentration dependent and, with a half-life of 7–9 h, telavancin is suitable for once-daily dosing [<xref ref-type="bibr" rid="CR51">51</xref>, <xref ref-type="bibr" rid="CR52">52</xref>]. On the basis of the results of the Assessment of Telavancin for Treatment of Hospital-Acquired Pneumonia (ATTAIN) studies, telavancin was approved in Europe (2011) and the USA (2013) for the treatment of HAP caused by Gram-positive pathogens including MRSA when alternative therapies are not suitable (Table <xref rid="Tab2" ref-type="table">2</xref>) [<xref ref-type="bibr" rid="CR45">45</xref>]. The two ATTAIN studies (ClinicalTrials.gov identifiers, NCT00107952 and NCT00124020) were double-blind, phase 3 clinical trials that assessed the efficacy and safety of telavancin in a total of 1503 patients with HAP caused by Gram-positive pathogens [<xref ref-type="bibr" rid="CR53">53</xref>]. In the pooled all-treated population, intravenous (i.v.) telavancin 10 mg/kg every 24 h (<italic>n</italic> = 749) was non-inferior to vancomycin 1 g i.v. every 12 h (<italic>n</italic> = 754) in terms of clinical cure rate at the follow-up/test-of-cure (TOC) visit [58.9% vs. 59.5%, respectively; 95% confidence interval (CI) for the difference −5.6%, 4.3%]. Moreover, in the subgroup of patients with <italic>S.</italic> <italic>aureus</italic> infection (<italic>n</italic> = 433), telavancin provided a higher clinical cure rate at the TOC visit than vancomycin (78.1% vs. 75.2%; 95% CI for the difference −5.0%, 11.0%). Cure rates were similar in the subgroup of patients with MRSA infection (<italic>n</italic> = 293; 74.8% and 74.7% for telavancin and vancomycin, respectively; 95% CI for the difference −9.5%, 10.4%).</p><p>A post hoc analysis reported similar 28-day survival rates with telavancin and vancomycin (76% and 77%, respectively) [<xref ref-type="bibr" rid="CR55">55</xref>], consistent with the mortality data from the original analyses [<xref ref-type="bibr" rid="CR53">53</xref>]. However, lower survival rates were observed with telavancin compared with vancomycin (59% vs. 70%) in patients with moderate-to-severe renal insufficiency (creatinine clearance <50 mL/min) [<xref ref-type="bibr" rid="CR54">54</xref>, <xref ref-type="bibr" rid="CR55">55</xref>]; consequently, a black box warning for patients with inadequate renal function was added to the label in the USA. A subsequent post hoc analysis of the ATTAIN studies has suggested that the higher mortality rate for telavancin compared with vancomycin (telavancin, 179/751 patients; vancomycin, 163/752 patients) may have been confounded by inadequate coverage of Gram-negative infections, especially in the telavancin group [<xref ref-type="bibr" rid="CR54">54</xref>]. Indeed, there were more patients with Gram-negative only infections and with inadequate treatment of those infections in the telavancin group than the vancomycin group. However, consistent with the black box warning, the post hoc analysis also found increased mortality with telavancin compared with vancomycin in patients with poor renal function (telavancin, 20/32 patients; vancomycin, 7/27 patients [creatinine clearance <30 mL/min]) [<xref ref-type="bibr" rid="CR54">54</xref>].</p><p>Rates of treatment-emergent adverse events (AEs) were the same for telavancin and vancomycin (both 82%); the most common AEs were diarrhea, anemia, hypokalemia, constipation, and renal impairment. The proportion of patients experiencing serious AEs was higher in the telavancin group than in the vancomycin group (31% vs. 26%). AEs leading to study discontinuation were also higher with telavancin than with vancomycin (8% vs. 5%); acute renal failure was the most common AE associated with discontinuation in the telavancin group (1.2%) [<xref ref-type="bibr" rid="CR53">53</xref>]. AEs associated with telavancin included transient elevations in serum creatinine levels, thrombocytopenia and QT prolongation, although to date no cardiovascular events attributed to QT prolongation have been reported [<xref ref-type="bibr" rid="CR53">53</xref>, <xref ref-type="bibr" rid="CR56">56</xref>–<xref ref-type="bibr" rid="CR58">58</xref>]. It is recommended that patients receiving telavancin are monitored closely (particularly, their renal function), owing to the associated AEs [<xref ref-type="bibr" rid="CR45">45</xref>].</p><p>The potent activity of telavancin against Gram-positive HAP pathogens (including MRSA, vancomycin-intermediate <italic>S.</italic> <italic>aureus</italic>, and penicillin-resistant <italic>S.</italic> <italic>pneumoniae</italic>), and the convenient, once-daily dosing regimen may offer advantages over conventional therapies (Table <xref rid="Tab2" ref-type="table">2</xref>). However, telavancin is not effective against Gram-negative bacteria [<xref ref-type="bibr" rid="CR59">59</xref>]. In addition, it is not indicated for patients with severe renal impairment and the risk of nephrotoxicity necessitates constant monitoring of renal function [<xref ref-type="bibr" rid="CR45">45</xref>].</p></sec><sec id="Sec11"><title>Ceftobiprole Medocaril</title><p>Ceftobiprole medocaril, the prodrug of the active moiety ceftobiprole, is a new-generation, broad-spectrum i.v. cephalosporin. Ceftobiprole has unique activity against MRSA and a broad range of Gram-positive and Gram-negative pathogens [<xref ref-type="bibr" rid="CR60">60</xref>], with high activity against methicillin-susceptible <italic>S. aureus</italic>, MRSA and <italic>S.</italic> <italic>pneumoniae</italic> (100%, 98.3%, and 99.3% susceptibility, respectively) [<xref ref-type="bibr" rid="CR61">61</xref>]. Interestingly, ceftobiprole appears to have high affinity for most penicillin-binding proteins (PBPs); in <italic>Escherichia</italic> <italic>coli</italic>, the major targets seem to be PBP1b and PBP2 rather than PBP3 (the target for third-generation cephalosporins) [<xref ref-type="bibr" rid="CR62">62</xref>]. This PBP binding contributes to the potent activity of ceftobiprole against most <italic>Enterobacteriaceae</italic> spp. (87.3% susceptibility); the activity of ceftobiprole against <italic>P. aeruginosa</italic> is similar to that of ceftazidime (64.6% susceptibility) [<xref ref-type="bibr" rid="CR61">61</xref>].</p><p>The efficacy of ceftobiprole in patients with HAP was assessed in a double-blind, randomized, controlled phase 3 study (<italic>n</italic> = 781, intent-to-treat [ITT] population, including 210 patients with VAP) with a dosing regimen of 500 mg i.v. every 8 h (ClinicalTrials.gov identifiers: NCT00210964 and NCT00229008) [<xref ref-type="bibr" rid="CR63">63</xref>]. Ceftobiprole was non-inferior to ceftazidime for clinical cure (2 g i.v. every 8 h, plus linezolid 600 mg i.v. twice daily) for both the whole population (ITT; 49.9% vs. 52.8%, respectively) and the HAP-specific patient subgroup (<italic>n</italic> = 571; 59.6% vs. 58.8%, respectively), although not in patients with VAP (23.1% vs. 36.8%, respectively) [<xref ref-type="bibr" rid="CR63">63</xref>]. This difference in clinical cure rates was also evident when microbiologically evaluable (<italic>n</italic> = 332) patients were stratified according to baseline pathogen profile [<xref ref-type="bibr" rid="CR63">63</xref>]. The microbiological eradication rates in patients with HAP (excluding VAP) were 62.9% vs. 67.5% in the ceftobiprole and ceftazidime plus linezolid groups, respectively; in patients with VAP, the microbiological eradication rates were 30.4% vs. 50.0%, respectively. Overall, 30-day all-cause mortality and 30-day pneumonia-specific mortality were similar in the ceftobiprole and ceftazidime/linezolid treatment groups. Similar rates of treatment-related AEs were reported for ceftobiprole (24.9%) and ceftazidime/linezolid (25.4%) [<xref ref-type="bibr" rid="CR63">63</xref>, <xref ref-type="bibr" rid="CR64">64</xref>]. Furthermore, in a randomized controlled trial in 638 patients requiring hospitalization for CAP (ClinicalTrials.gov identifier: NCT00326287), ceftobiprole 500 mg i.v. twice daily was shown to be non-inferior to ceftriaxone 2 g i.v. once daily (with or without linezolid 600 mg i.v. twice daily) for clinical cure [<xref ref-type="bibr" rid="CR65">65</xref>].</p><p>Regulatory approval for ceftobiprole was obtained in October 2013 for the treatment of CAP and HAP, but not VAP, in 13 European countries (Table <xref rid="Tab2" ref-type="table">2</xref>) [<xref ref-type="bibr" rid="CR46">46</xref>, <xref ref-type="bibr" rid="CR66">66</xref>]. Ceftobiprole is also approved in Canada. At present, it is not approved in the USA (Table <xref rid="Tab2" ref-type="table">2</xref>). The Food and Drugs Administration (FDA) raised some Good Clinical Practice concerns in 2008 over a number of ceftobiprole studies, but this was with regard to studies in complicated skin infections and did not affect those for pneumonia (HAP or CAP). Importantly, following inspections of the pneumonia clinical trial sites conducted by regulatory agencies during the European regulatory review, it was concluded that the data from these studies were reliable and represent a fair assessment of the efficacy and safety of ceftobiprole in these indications. Moreover, in August 2015, the FDA designated ceftobiprole as a Qualified Infectious Disease Product with potential use in the treatment of CAP and acute bacterial skin and skin structure infections.</p><p>The standard dose of ceftobiprole is 500 mg every 8 h; dose adjustment of ceftobiprole is recommended in patients with moderate or severe renal impairment [<xref ref-type="bibr" rid="CR46">46</xref>]. In individuals with moderate impairment (CL<sub>CR</sub> 30 to <50 mL/min), the recommended dose is 500 mg administered as a 2-h i.v. infusion every 12 h; for those with severe impairment (CL<sub>CR</sub> <30 mL/min) the recommended dose is 250 mg administered as a 2-h i.v. infusion every 12 h, and for patients with end-stage renal disease the recommended dose is 250 mg once every 24 h [<xref ref-type="bibr" rid="CR46">46</xref>]. There is no need for dose adjustment based on sex, ethnicity, age, or hepatic impairment [<xref ref-type="bibr" rid="CR46">46</xref>].</p></sec><sec id="Sec12"><title>Tedizolid</title><p>Tedizolid is a novel oxazolidinone antibiotic with potent activity against a wide range of Gram-positive pathogens, including MRSA and vancomycin-resistant enterococci (MIC<sub>90</sub> 0.25–0.5 μg/mL) [<xref ref-type="bibr" rid="CR67">67</xref>]. A phase 3, randomized, double-blind study comparing the efficacy and safety of tedizolid and linezolid is ongoing in patients with HAP and VAP, and is expected to be complete in February 2018 (ClinicalTrials.gov identifier: NCT02019420).</p></sec></sec><sec id="Sec13"><title>Conclusion</title><p>Both HAP and HCAP are common infections associated with high mortality and resource utilization. HCAP is not consistently recognized, but may be associated with an etiology more closely related to HAP than CAP. It is important to treat HAP and HCAP early with broad-spectrum antibiotics, because inadequate empirical therapy is associated with increased mortality and health-care costs. The current treatments for HAP and HCAP include all broad-spectrum antibiotics, but the burden of HAP and HCAP remains high. Additional treatment options have recently become available. Telavancin exhibits potent antibacterial activity against a range of Gram-positive bacteria, including MRSA, and has demonstrated non-inferiority to vancomycin in patients with HAP. The new-generation cephalosporin ceftobiprole shows rapid and potent antibacterial activity against a broad range of both Gram-positive (including MRSA) and Gram-negative pathogens important in HAP. It has demonstrated non-inferiority to combination therapy with ceftazidime and linezolid in patients with HAP (excluding VAP). These new agents may offer effective alternative options for the management of HAP.</p></sec><sec sec-type="supplementary-material"><title>Electronic supplementary material</title><sec id="Sec14"><supplementary-material content-type="local-data" id="MOESM1"><media xlink:href="12325_2016_293_MOESM1_ESM.pdf"><caption><p>Supplementary material 1 (PDF 269 kb)</p></caption></media></supplementary-material></sec></sec></body><back><ack><p>Medical writing assistance for this manuscript was provided by Dr Mark Rolfe and Dr Lizzy McAdam-Gray of Oxford PharmaGenesis, Oxford, UK; support for this assistance was funded by Basilea Pharmaceutica Ltd., Basel, Switzerland. All named authors meet the International Committee of Medical Journal Editors criteria for authorship for this manuscript, take responsibility for the integrity of the work as a whole, and have given final approval to the version to be published.</p><sec id="FPar1"><title>Disclosures</title><p>Philippe Montravers has been a speaker for Astellas, AstraZeneca, Basilea, Cubist, Gilead, MSD, Pfizer, and The Medicines Company, and an advisory board member for Astellas, AstraZeneca, Cubist, MSD, Pfizer, and The Medicines Company. Adela Harpan and Elise Guivarch have nothing to disclose.</p></sec><sec id="FPar2"><title>Compliance with Ethics Guidelines</title><p>This article is based on previously conducted studies and does not involve any new studies of human or animal subjects performed by any of the authors.</p></sec><sec id="d30e1487"><title>Open Access</title><p>This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc/4.0/">http://creativecommons.org/licenses/by-nc/4.0/</ext-link>), which permits any noncommercial use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.</p></sec></ack><ref-list id="Bib1"><title>References</title><ref id="CR1"><label>1.</label><element-citation 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