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Sader HS, Castanheira M, Flamm RK, Huband MD, Jones RN. Ceftazidime-Avibactam Activity against Aerobic Gram Negative Organisms Isolated from Intra-Abdominal Infections in United States Hospitals, 2012-2014. Surg Infect (Larchmt) 2016; 17:473-8. [PMID: 27104633 DOI: 10.1089/sur.2016.036] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Ceftazidime-avibactam is ceftazidime combined with the novel non-β-lactam β-lactamase inhibitor avibactam, which inhibits Ambler class A (e.g., extended-spectrum β-lactamase [ESBL] and KPC), class C, and some class D enzymes. We evaluated the activity of ceftazidime-avibactam against aerobic gram negative bacteria causing intra-abdominal infections (IAI). METHODS A total of 1,540 isolates were collected, one each from patient, with IAI in 57 United States hospitals in 2012-2014. Susceptibility testing was performed by reference broth microdilution methods, and Enterobacteriaceae isolates with an ESBL phenotype were evaluated by a microarray-based assay for the presence of genes encoding the CTX-M, TEM, SHV, KPC, NDM, and transferable AmpC enzymes. RESULTS All Escherichia coli isolates were susceptible to ceftazidime-avibactam, whereas the susceptibility rates for meropenem, piperacillin-tazobactam, and gentamicin were 99.8%, 93.6%, and 85.5%, respectively. Among Klebsiella pneumoniae isolates, the highest ceftazidime-avibactam minimum inhibitory concentration (MIC) value was only 2 mcg/mL (MIC50/90 0.12/0.25 mcg/mL; 100% susceptible), whereas susceptibility rates to meropenem and gentamicin were 94.5% and 91.9%, respectively. The ESBL-phenotype rates among E. coli and K. pneumoniae were 15.8% and 13.3%, respectively. Overall, only one Enterobacteriaceae isolate (Enterobacter cloacae) was not susceptible to ceftazidime-avibactam and had negative results for all β-lactamases tested. Against Pseudomonas aeruginosa, ceftazidime-avibactam (MIC50/90 2/4 mcg/mL; 97.1% susceptible) and amikacin (MIC50/90 2/8 mcg/mL; 99.0% susceptible) were the most active compounds, and ceftazidime-avibactam retained activity against many meropenem-non-susceptible (88.6% susceptible) and piperacillin-tazobactam-non-susceptible (82.9% susceptible) strains. CONCLUSION Ceftazidime-avibactam coverage (98.7% inhibited at ≤8 mcg/mL) of intra-abdominal infection pathogens was greater than that observed for meropenem (95.7% susceptible) and piperacillin-tazobactam (88.4% susceptible).
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Sader HS, Flamm RK, Mendes RE, Farrell DJ, Jones RN. Antimicrobial Activities of Ceftaroline and Comparator Agents against Bacterial Organisms Causing Bacteremia in Patients with Skin and Skin Structure Infections in U.S. Medical Centers, 2008 to 2014. Antimicrob Agents Chemother 2016; 60:2558-63. [PMID: 26856825 PMCID: PMC4808146 DOI: 10.1128/aac.02794-15] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 01/31/2016] [Indexed: 11/20/2022] Open
Abstract
We evaluated the antimicrobial susceptibility of 1,454 organisms consecutively collected from patients with bacteremia associated with skin and skin structure infections. The most common organisms obtained wereStaphylococcus aureus(670 organisms [46.1%]),Escherichia coli(200 organisms [13.8%]), β-hemolytic streptococci (βHS) (138 organisms [9.5%]), andKlebsiella pneumoniae(109 organisms [7.5%]). The susceptibility rates for ceftaroline were 97.9% forS. aureus(95.9% among methicillin-resistantS. aureus[MRSA]), 100.0% for βHS, 86.5% forE. coli, and 89.0% forK. pneumoniae Ceftaroline and tigecycline provided the best overall coverage.
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Mendes RE, Hogan PA, Jones RN, Sader HS, Flamm RK. Surveillance for linezolid resistance via the Zyvox®Annual Appraisal of Potency and Spectrum (ZAAPS) programme (2014): evolving resistance mechanisms with stable susceptibility rates. J Antimicrob Chemother 2016; 71:1860-5. [DOI: 10.1093/jac/dkw052] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 02/08/2016] [Indexed: 11/13/2022] Open
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Flamm RK, Nichols WW, Sader HS, Farrell DJ, Jones RN. In vitro activity of ceftazidime/avibactam against Gram-negative pathogens isolated from pneumonia in hospitalised patients, including ventilated patients. Int J Antimicrob Agents 2016; 47:235-42. [DOI: 10.1016/j.ijantimicag.2016.01.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 01/12/2016] [Accepted: 01/13/2016] [Indexed: 10/22/2022]
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Sader HS, Rhomberg PR, Castanheira M, Farrell DJ, Flamm RK, Mendes RE, Jones RN. Ceftaroline activity tested against viridans group streptococci from US hospitals. Diagn Microbiol Infect Dis 2016; 84:232-5. [PMID: 26658313 DOI: 10.1016/j.diagmicrobio.2015.10.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Revised: 10/28/2015] [Accepted: 10/30/2015] [Indexed: 01/18/2023]
Abstract
A total of 840 clinically relevant viridans group streptococci (VGS) isolates (1/patient episode) were collected from 71 US medical centers in 2013-2014. These organisms were tested for susceptibility by reference broth microdilution methods against ceftaroline and selected comparator agents. All isolates were speciated by matrix-assisted laser desorption ionization-time-of-flight (MALDI-TOF) mass spectrometry and were primarily from skin/soft tissue (32.6%) and bloodstream (32.3%) infections. Ceftaroline was highly active against all VGS species/groups with MIC50 and MIC90 values ranging from ≤0.015 to 0.03μg/mL and ≤0.015 to 0.06μg/mL, respectively. The highest ceftaroline MIC value was only 0.5μg/mL (0.5% of strains) and ceftaroline (MIC50/90, 0.03/0.06μg/mL) was 8-fold more active than ceftriaxone (MIC50/90, 0.25/0.5μg/mL). The VGS groups most susceptible to ceftaroline were Streptococcus mutans and Streptococcus bovis (MIC90, ≤0.015μg/mL), whereas the highest ceftaroline MIC values were observed among Streptococcus mitis and Streptococcus sanguinis groups. In summary, ceftaroline exhibited potent in vitro activity against VGS, including many uncommonly isolated species/groups for which very limited susceptibility information is currently available to guide therapy.
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Costello SE, Gales AC, Morfin-Otero R, Jones RN, Castanheira M. Mechanisms of Resistance, Clonal Expansion, and Increasing Prevalence of Acinetobacter baumannii Strains Displaying Elevated Tigecycline MIC Values in Latin America. Microb Drug Resist 2015; 22:253-8. [PMID: 26716768 DOI: 10.1089/mdr.2015.0168] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The aim of the study was to characterize forty-eight Acinetobacter baumannii (ACB) isolates with confirmed tigecycline MIC values >2 mg/L observed in six Latin American (LATAM) hospitals (four countries) in 2011. During 2005-2011, 6,923 ACB isolates were collected as part of the SENTRY Program, and tigecycline susceptibility was quantified using the reference broth microdilution method. A total of 102/1881 ACB from LATAM hospitals displayed tigecycline minimum inhibitory concentration (MIC) values >2 mg/L, showing an increase from 4.3% in 2010 to 10.5% in 2011, which is considerably high when compared to other geographical regions. Forty-eight ACB from 2011 displaying elevated tigecycline MICs were typed by pulsed-field gel electrophoresis, which showed multiple clusters in Sao Paulo, Brazil, and a major clone in Guadalajara, Mexico. Eighteen unique isolates had the expression of adeA and adeF determined and results compared to a group of tigecycline-susceptible strains, which demonstrated that 18/18 strains had significantly increased expression of AdeABC and three isolates overexpressed AdeFGH. Sequencing of adeS and adeR revealed that 11 isolates displayed adeS mutations, and 5 isolates had mutations in adeR. Sequencing of trm showed frameshift mutations in eight isolates and insertion sequences leading to nonfunctional proteins in three isolates. TetX-encoding genes were not detected. We documented the recent increase of ACB displaying elevated tigecycline MICs in LATAM hospitals, dominantly due to the clonal expansion of isolates in Brazil and Mexico. Control of tigecycline usage in those countries and more strict infection control practices in the involved hospitals should be considered to reduce such outbreaks.
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Mendes RE, Castanheira M, Gasink L, Stone GG, Nichols WW, Flamm RK, Jones RN. β-Lactamase Characterization of Gram-Negative Pathogens Recovered from Patients Enrolled in the Phase 2 Trials for Ceftazidime-Avibactam: Clinical Efficacies Analyzed against Subsets of Molecularly Characterized Isolates. Antimicrob Agents Chemother 2015; 60:1328-35. [PMID: 26666936 PMCID: PMC4775982 DOI: 10.1128/aac.01173-15] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 12/05/2015] [Indexed: 11/30/2022] Open
Abstract
The correlation of the clinical efficacies of ceftazidime-avibactam and comparators (carbapenems) was evaluated against baseline Gram-negative isolates having characterized β-lactam resistance mechanisms from complicated urinary tract infection (cUTI) and complicated intra-abdominal infection (cIAI) phase 2 trials. Enterobacteriaceae displaying ceftriaxone and/or ceftazidime MICs of ≥ 2 μg/ml (69 isolates) and nonfermentative Gram-negative bacilli (NF-GNB [three isolates]) with ceftazidime MICs of ≥ 16 μg/ml were characterized for their narrow- and extended-spectrum β-lactamase (ESBL) content. Enterobacteriaceae (one isolate) and NF-GNB (three isolates) with imipenem/meropenem MICs of ≥ 2 and ≥ 16 μg/ml, respectively, were tested for carbapenemases. All cUTI E. coli had the lineage background investigated (ST131-like versus non-ST131-like). The primary efficacy endpoint was microbiological response (eradication) at test of cure (TOC) for cUTI and clinical response (inferred microbiological eradication) at TOC for cIAI. A total of 34.1% of baseline cUTI (36.4%) and cIAI (33.1%) pathogens met the MIC-based screening criteria (screen positive). All screen-positive cUTI pathogens were CTX-M-producing E. coli, except for one E. cloacae isolate with AmpC overexpression. The majority (66.7%) of screen-positive cIAI isolates produced CTX-M-type coupled with a diverse array of other β-lactamases. Similar favorable responses were observed with ceftazidime-avibactam (93.3%) and carbapenems (90.9%), when a non-ESBL Enterobacteriaceae isolate was recovered at the baseline visit. When an ESBL Enterobacteriaceae isolate was present, the favorable responses were 85.7% and 80.0% with ceftazidime-avibactam and carbapenems, respectively. Higher favorable responses were observed with ceftazidime-avibactam (75.0%) than with carbapenems (66.7%) when an ST131-like E. coli isolate was recovered at baseline, as when a non-ST131-like isolate was present (93.8% versus 86.7%, respectively). The efficacy of ceftazidime-avibactam was similar to that of carbapenems for treatment of cUTI and cIAI caused by ESBL organisms.
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Farrell DJ, Flamm RK, Mendes RE, Jones RN. The Activity of Tedizolid Against Gram-Positive Pathogens Isolated From Patients in USA Medical Centers: 2014 Surveillance. Open Forum Infect Dis 2015. [DOI: 10.1093/ofid/ofv133.896] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mendes RE, Castanheira M, Woosley LN, Costello SE, Stone GG, Flamm RK, Jones RN. β-Lactamase Characterization of Baseline Enterobacteriaceae (ENT) From a Phase 3 Trial of Ceftazidime-Avibactam (CAZ-AVI) for the Treatment of Infections Caused by CAZ-Nonsusceptible (NS) Pathogens. Open Forum Infect Dis 2015. [DOI: 10.1093/ofid/ofv133.888] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Mendes RE, Sader HS, Flamm RK, Smart JI, Farrell DJ, Jones RN. Analysis of Telavancin In Vitro Activity Tested Against a USA Collection of Staphylococcus aureus Clinical Isolates Causing Hospital-Acquired Pneumonia (2013–2014). Open Forum Infect Dis 2015. [DOI: 10.1093/ofid/ofv133.1392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sader HS, Flamm RK, Mendes RE, Farrell DJ, Jones RN. Antimicrobial Activity of Ceftaroline and Comparator Agents Tested Against Bacterial Organisms Causing Bacteremia in Patients With Skin and Skin Structure Infections (SSSI) in United States (USA) Medical Centers (2008–2014). Open Forum Infect Dis 2015. [DOI: 10.1093/ofid/ofv133.1096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Huband MD, Flamm RK, Rhomberg PR, Jones RN, Castanheira M. In Vitro Antibacterial Activity of Meropenem/RPX7009, (A Carbapenem/â-lactamase Inhibitor Combination) Against Contemporary Enterobacteriaceae (ENT) Isolated From Intra-abdominal (IAI) and Urinary Tract Infections (UTI) in the United States. Open Forum Infect Dis 2015. [DOI: 10.1093/ofid/ofv133.498] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Mendes RE, Sader HS, Flamm RK, Farrell DJ, Jones RN. Contemporary Analysis of Oritavancin In Vitro Activity Against Staphylococcus aureus Responsible for Invasive Community- and Hospital-Associated Infections Among Patients in the USA (2013–2014). Open Forum Infect Dis 2015. [DOI: 10.1093/ofid/ofv133.1393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Farrell DJ, Sader HS, Castanheira M, Jones RN. The Activity of Ceftolozane/Tazobactam Against Gram-Negative Pathogens Isolated From Patients Hospitalized in Intensive Care Units in USA Hospitals (2013–2014). Open Forum Infect Dis 2015. [DOI: 10.1093/ofid/ofv133.887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Sader HS, Farrell DJ, Flamm RK, Castanheira M, Jones RN. Antimicrobial Activity of Ceftazidime-Avibactam and Comparator Agents Tested Against Gram-Negative Organisms Isolated From Urinary Tract Infections (UTI): Results From the International Network for Optimal Resistance Monitoring (INFORM) Program. Open Forum Infect Dis 2015. [DOI: 10.1093/ofid/ofv133.494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sader HS, Farrell DJ, Mendes RE, Flamm RK, Jones RN. Comparative Evaluation of the Antimicrobial Susceptibility Patterns of Community- and Hospital-Acquired Methicillin-Resistant S. aureus (MRSA) From US Hospitals by Site of Infection: Results From the Ceftaroline Surveillance Program AWARE (2012–2014). Open Forum Infect Dis 2015. [DOI: 10.1093/ofid/ofv133.831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Sader HS, Castanheira M, Farrell DJ, Flamm RK, Jones RN. Ceftazidime-avibactam activity when tested against ceftazidime-nonsusceptible Citrobacter spp., Enterobacter spp., Serratia marcescens, and Pseudomonas aeruginosa from Unites States medical centers (2011–2014). Diagn Microbiol Infect Dis 2015; 83:389-94. [DOI: 10.1016/j.diagmicrobio.2015.06.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Revised: 06/09/2015] [Accepted: 06/13/2015] [Indexed: 10/23/2022]
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Mendes RE, Castanheira M, Farrell DJ, Flamm RK, Sader HS, Jones RN. Update on dalbavancin activity tested against Gram-positive clinical isolates responsible for documented skin and skin-structure infections in US and European hospitals (2011-13). J Antimicrob Chemother 2015; 71:276-8. [PMID: 26451012 DOI: 10.1093/jac/dkv303] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sader HS, Castanheira M, Flamm RK, Mendes RE, Farrell DJ, Jones RN. Tigecycline activity tested against carbapenem-resistant Enterobacteriaceae from 18 European nations: results from the SENTRY surveillance program (2010–2013). Diagn Microbiol Infect Dis 2015; 83:183-6. [DOI: 10.1016/j.diagmicrobio.2015.06.011] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 06/15/2015] [Accepted: 06/19/2015] [Indexed: 02/04/2023]
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Sader HS, Farrell DJ, Flamm RK, Jones RN. Analysis of 5-year trends in daptomycin activity tested against Staphylococcus aureus and enterococci from European and US hospitals (2009–2013). J Glob Antimicrob Resist 2015; 3:161-165. [DOI: 10.1016/j.jgar.2015.04.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 12/18/2014] [Accepted: 04/10/2015] [Indexed: 11/28/2022] Open
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Mendes RE, Hollingsworth RC, Costello A, Jones RN, Isturiz RE, Hewlett D, Farrell DJ. Noninvasive Streptococcus pneumoniae serotypes recovered from hospitalized adult patients in the United States in 2009 to 2012. Antimicrob Agents Chemother 2015; 59:5595-601. [PMID: 26124173 PMCID: PMC4538538 DOI: 10.1128/aac.00182-15] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Accepted: 06/23/2015] [Indexed: 01/01/2023] Open
Abstract
This study was conducted to determine the serotype distribution and trends over time of Streptococcus pneumoniae strains associated with noninvasive infections among adult patients ≥18 years of age in the United States (2009 to 2012). A total of 2,927 S. pneumoniae isolates recovered from patients presenting with respiratory infections and obtained mainly (87.0%) from lower respiratory tract specimens (sputum) were included. The levels of the 7-valent pneumococcal conjugate vaccine (PCV7) serotypes remained stable over the 4-year study period (4.6% to 5.5%; P = 0.953). Overall, 13-valent pneumococcal conjugate vaccine (PCV13) serotypes were identified in 32.7% of samples, declining from 33.7% to 35.5% in 2009 to 2011 to 28.2% in 2012 (P = 0.007), with a significant decrease in the levels of serotypes 7F (P = 0.013) and 6A (P = 0.010). The levels of 19A remained constant (15.8% to 17.1%) during 2009 to 2011, dropping to 12.2% in 2012 (P = 0.089). The prevalence of serotypes associated with the 23-valent pneumococcal polysaccharide vaccine (PPSV23), but not PCV13, remained generally stable; however, the prevalence of serotypes 15B and 15C (15B/15C) increased from 2.7% to 6.3% (P = 0.010). The proportion of nonvaccine serotypes increased gradually during the study period (P = 0.044), particularly for serotype 35B (from 3.6% in 2009 to 8.2% in 2012; P = 0.001). Nonsusceptibility rates for penicillin (susceptible breakpoint, ≤2 μg/ml) and clindamycin against PCV7 serotypes decreased over the period. These results suggest the emergence of indirect effects following introduction of PCV13 for infants and young children; continued surveillance is needed to assess the burden of PCV13 serotypes in the adult population after the implementation of age-based recommendations in the United States.
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Sader HS, Rhomberg PR, Farrell DJ, Jones RN. Differences in potency and categorical agreement between colistin and polymyxin B when testing 15,377 clinical strains collected worldwide. Diagn Microbiol Infect Dis 2015; 83:379-81. [PMID: 26415906 DOI: 10.1016/j.diagmicrobio.2015.08.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Revised: 08/20/2015] [Accepted: 08/23/2015] [Indexed: 11/29/2022]
Abstract
Gram-negative bacilli (n=15,377) were tested against colistin (polymyxin E) and polymyxin B by a commercial broth microdilution method (Sensititre®). Among Pseudomonas aeruginosa and Acinetobacter spp., colistin and polymyxin B MIC values were within ±1 doubling dilution for >99.0% of strains. Among Klebsiella spp. and Escherichia coli, 55.0 and 53.2% of strains displayed a colistin MIC 2-fold lower than polymyxin B, but polymyxin B was slightly more potent than colistin against strains with decreased susceptibility to either polymyxin.
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Mendes RE, Deshpande LM, Costello AJ, Farrell DJ, Jones RN, Flamm RK. Genotypic Characterization of Methicillin-Resistant Staphylococcus aureus Recovered at Baseline from Phase 3 Pneumonia Clinical Trials for Ceftobiprole. Microb Drug Resist 2015; 22:53-8. [PMID: 26230870 PMCID: PMC4722542 DOI: 10.1089/mdr.2014.0307] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Baseline methicillin-resistant Staphylococcus aureus (MRSA) isolates from patients with nosocomial and community-acquired pneumonia collected during Phase 3 trials for ceftobiprole were characterized. Eighty-four unique isolates from patients enrolled in Europe (50.0%), Asia-Western Pacific region (APAC; 20.2%), North America (19.0%), Latin America (8.3%), and South Africa (2.4%) were included. Antimicrobial susceptibility testing was performed by broth microdilution and isolates screened for Panton-Valentine leukocidin. SCCmec and agr types were determined. Strains were subjected to pulsed-field gel electrophoresis and spa typing. Clonal complexes (CCs) were assigned based on spa and/or multilocus sequence typing. Most isolates were CC5-MRSA-I/II/IV (44.0%; 37/84), followed by CC8-MRSA-IV (22.6%; 19/84) and CC239-MRSA-III (21.4%; 18/84). Other MRSA formed seven clonal clusters. Isolates from North America were associated with USA100, while those from South America belonged to the Cordobes/Chilean CC. A greater clonal diversity was observed in Europe; however, each country had CC5, CC8, or CC239 as prevalent lineages. Isolates from APAC were CC5-MRSA-II (47.1%; 8/17) or CC239-MRSA-III (47.1%; 8/17). Isolates carrying SCCmec I and III had ceftobiprole MIC50 values of 2 μg/ml, while those isolates with SCCmec II and IV had MIC50 values of 1 μg/ml. Ceftobiprole inhibited 96% and 100.0% of the isolates at ≤2 and ≤4 μg/ml, respectively. These isolates represented common circulating MRSA clones. Ceftobiprole demonstrated in vitro activity with a slight variation of minimum inhibitory concentrations (MICs) according to SCCmec or clonal type.
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Sader HS, Farrell DJ, Flamm RK, Jones RN. Activity of ceftaroline and comparator agents tested against Staphylococcus aureus from patients with bloodstream infections in US medical centres (2009-13). J Antimicrob Chemother 2015; 70:2053-6. [PMID: 25814163 DOI: 10.1093/jac/dkv076] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 03/03/2015] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES The objective of this study was to evaluate the in vitro antimicrobial activity of ceftaroline and comparator agents tested against Staphylococcus aureus isolates causing bloodstream infection (BSI). METHODS A total of 4426 S. aureus isolates from patients with BSI were collected in 150 medical centres in the USA in 2009-13 and tested for susceptibility to ceftaroline and comparators by the CLSI broth microdilution method. RESULTS Overall, 45.5% of isolates were MRSA. Ceftaroline (MIC50/90, 0.25/1 mg/L) was active against 97.9% of S. aureus isolates at ≤1 mg/L (highest MIC, 2 mg/L). Daptomycin (MIC50/90, 0.25/0.5 mg/L), linezolid (MIC50/90, 1/2 mg/L) and vancomycin (MIC50/90, 1/1 mg/L) were active against ≥99.8% of isolates at the respective susceptible breakpoints. Susceptibility rates for clindamycin (MIC50/90, ≤0.25/>2 mg/L) and levofloxacin (MIC50/90, ≤0.5/>4 mg/L) were 80.8% and 59.2%, respectively. Against MSSA, ceftaroline (MIC50/90, 0.25/0.25 mg/L; 100.0% susceptible) was 16-, 4-8- and 4-fold more active in vitro (based on MIC50/90) than ceftriaxone (MIC50/90, 4/4 mg/L), linezolid (MIC50/90, 1/2 mg/L) and vancomycin (MIC50/90, 1/1 mg/L), respectively, and slightly more potent than daptomycin (MIC50/90, 0.25/0.5 mg/L). When tested against MRSA, ceftaroline was active against 95.4% and 100.0% of isolates at ≤1 and ≤2 mg/L, respectively. Moreover, ceftaroline retained significant activity against S. aureus with reduced susceptibility to vancomycin, daptomycin, clindamycin, levofloxacin and trimethoprim/sulfamethoxazole. CONCLUSIONS Ceftaroline demonstrated potent in vitro activity when tested against a large collection of contemporary (2009-13) S. aureus isolates causing BSI in US hospitals.
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Castanheira M, Mendes RE, Jones RN. Update on Acinetobacter species: mechanisms of antimicrobial resistance and contemporary in vitro activity of minocycline and other treatment options. Clin Infect Dis 2015; 59 Suppl 6:S367-73. [PMID: 25371512 DOI: 10.1093/cid/ciu706] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Among Acinetobacter species, A. baumannii and other closely related species are commonly implicated in nosocomial infections. These organisms are usually multidrug resistant (MDR), and therapeutic options to treat A. baumannii infections are very limited. Clinicians have been resorting to older antimicrobial agents to treat infections caused by MDR A. baumannii, and some of these agents have documented toxicity and/or are not optimized for the infection type to be treated. Recent clinical experience supported by antimicrobial susceptibility data suggests that minocycline has greater activity than other tetracyclines and glycylcyclines against various MDR pathogens that have limited therapeutic options available, including Acinetobacter species. An intravenous formulation of minocycline has recently become available for clinical use, and in contrast to most older tetracyclines, minocycline has high activity against Acinetobacter species. In this report, we summarized some of the characteristics of the tetracycline class, and quantified the minocycline activity against contemporary (2007-2011) isolates and its potential therapeutic role against a collection of 5477 A. baumannii and other relevant gram-negative organisms when compared directly with tetracycline, doxycycline, and other broad-spectrum antimicrobial agents. Acinetobacter baumannii strains were highly resistant to all agents tested, with the exception of minocycline (79.1% susceptible) and colistin (98.8% susceptible). Minocycline (minimum inhibitory concentration that inhibits 50% and 90% of the isolates [MIC(50/90)]: 1/8 µg/mL) displayed greater activity than doxycycline (MIC(50/90): 2/>8 µg/mL) and tetracycline hydrochloride (HCL) (only 30.2% susceptible) against A. baumannii isolates, and was significantly more active than other tetracyclines against Burkholderia cepacia, Escherichia coli, Serratia marcescens, and Stenotrophomonas maltophilia isolates. In vitro susceptibility testing using tetracycline HCL as a surrogate for the susceptibility other tetracyclines fails to detect minocycline-susceptible isolates and the potential utility of minocycline for the treatment of many MDR A. baumannii infections and other difficult-to-treat species, where there are often limited choices of antimicrobials.
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Sader HS, Farrell DJ, Mendes RE, Flamm RK, Castanheira M, Jones RN. Antimicrobial activity of ceftaroline tested against bacterial isolates causing respiratory tract and skin and skin structure infections in US medical centers in 2013. Diagn Microbiol Infect Dis 2015; 82:78-84. [PMID: 25708896 DOI: 10.1016/j.diagmicrobio.2015.01.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Revised: 01/27/2015] [Accepted: 01/30/2015] [Indexed: 01/22/2023]
Abstract
A total of 4533 isolates from community-acquired respiratory tract infections (CARTIs) and 8446 from skin and skin structure infections (SSSIs) were consecutively collected in 149 US medical centers in 2013. Strains were susceptibility tested by broth microdilution method against ceftaroline and numerous comparators. Ceftaroline (MIC(50/90), ≤0.015/0.12 μg/mL) was more potent than ceftriaxone (MIC(50/90), ≤0.06/1 μg/mL) against Streptococcus pneumoniae and highly active against ceftriaxone-nonsusceptible strains (n=201; MIC(90), 0.25 μg/mL). Ceftaroline was also very active against Haemophilus influenzae (MIC(50/90), 0.008/0.015 μg/mL), methicillin-susceptible (MIC(50/90), 0.25/0.25 μg/mL) and methicillin-resistant Staphylococcus aureus (MIC(50/90), 1/1 μg/mL), and β-hemolytic streptococci (highest MIC, 0.03 μg/mL). Ceftaroline exhibited good activity against non-extended-spectrum β-lactamase (ESBL) phenotype isolates of Klebsiella spp. and Escherichia coli (96.7% susceptible and MIC(90) of 0.25 μg/mL for both) but limited activity against ESBL phenotype isolates. In summary, ceftaroline exhibited potent in vitro activity against a large collection of bacterial isolates causing CARTI and SSSI in US medical centers.
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Jones RN, Farrell DJ, Flamm RK, Sader HS, Dunne MW, Mendes RE. Surrogate analysis of vancomycin to predict susceptible categorization of dalbavancin. Diagn Microbiol Infect Dis 2015; 82:73-7. [DOI: 10.1016/j.diagmicrobio.2015.01.017] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 01/28/2015] [Accepted: 01/30/2015] [Indexed: 11/26/2022]
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Pfaller MA, Rhomberg PR, Messer SA, Jones RN, Castanheira M. Isavuconazole, micafungin, and 8 comparator antifungal agents' susceptibility profiles for common and uncommon opportunistic fungi collected in 2013: temporal analysis of antifungal drug resistance using CLSI species-specific clinical breakpoints and proposed epidemiological cutoff values. Diagn Microbiol Infect Dis 2015; 82:303-13. [PMID: 25986029 DOI: 10.1016/j.diagmicrobio.2015.04.008] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 04/21/2015] [Accepted: 04/24/2015] [Indexed: 10/23/2022]
Abstract
The in vitro activities of isavuconazole, micafungin, and 8 comparator antifungal agents were determined for 1613 clinical isolates of fungi (1320 isolates of Candida spp., 155 of Aspergillus spp., 103 of non-Candida yeasts, and 35 non-Aspergillus molds) collected during a global survey conducted in 2013. The vast majority of the isolates of the 21 different species of Candida, with the exception of Candida glabrata (MIC90, 2 μg/mL), Candida krusei (MIC90, 1 μg/mL), and Candida guilliermondii (MIC90, 8 μg/mL), were inhibited by ≤0.25 μg/mL of isavuconazole. C. glabrata and C. krusei were largely inhibited by ≤1 μg/mL of isavuconazole. Resistance to fluconazole was seen in 0.5% of Candida albicans isolates, 11.1% of C. glabrata isolates, 2.5% of Candida parapsilosis isolates, 4.5% of Candida tropicalis isolates, and 20.0% of C. guilliermondii isolates. Resistance to the echinocandins was restricted to C. glabrata (1.3-2.1%) and C. tropicalis (0.9-1.8%). All agents except for the echinocandins were active against 69 Cryptococcus neoformans isolates, and the triazoles, including isavuconazole, were active against the other yeasts. Both the mold active triazoles as well as the echinocandins were active against 155 Aspergillus spp. isolates belonging to 10 species/species complex. In general, there was low resistance levels to the available systemically active antifungal agents in a large, contemporary (2013), global collection of molecularly characterized yeasts and molds. Resistance to azoles and echinocandins was most prominent among isolates of C. glabrata, C. tropicalis, and C. guilliermondii.
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Flamm RK, Mendes RE, Hogan PA, Ross JE, Farrell DJ, Jones RN. In vitro activity of linezolid as assessed through the 2013 LEADER surveillance program. Diagn Microbiol Infect Dis 2015; 81:283-9. [DOI: 10.1016/j.diagmicrobio.2014.12.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 12/22/2014] [Accepted: 12/24/2014] [Indexed: 11/29/2022]
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Jones RN, Holliday NM, Critchley IA. Accuracy of the Thermo Fisher Scientific (Sensititre™) dry-form broth microdilution MIC product when testing ceftaroline. Diagn Microbiol Infect Dis 2015; 81:280-2. [PMID: 25623933 DOI: 10.1016/j.diagmicrobio.2014.12.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 12/22/2014] [Accepted: 12/24/2014] [Indexed: 11/23/2022]
Abstract
Ceftaroline, the active metabolite of the ceftaroline fosamil pro-drug, was the first advanced-spectrum cephalosporin with potent activity against methicillin-resistant Staphylococcus aureus to be approved by the US Food and Drug Administration for acute bacterial skin and skin structure infections. After 4 years of clinical use, few ceftaroline commercial susceptibility testing devices other than agar diffusion methods (disks and stable gradient) are available. Here, we validate a broth microdilution product (Sensititre™; Thermo Fisher Scientific, Cleveland, OH, USA) that achieved 99.2% essential agreement (manual and automated reading) and 95.3-100.0% categorical agreement, with high reproducibility (98.0-100.0%). Sensititre™ MIC values for ceftaroline, however, were slightly skewed toward an elevated value (0.5 × log2 dilution step), greatest when testing for streptococci and Enterobacteriaceae.
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Sader HS, Flamm RK, Streit JM, Farrell DJ, Jones RN. Ceftaroline activity against bacterial pathogens frequently isolated in U.S. medical centers: results from five years of the AWARE surveillance program. Antimicrob Agents Chemother 2015; 59:2458-61. [PMID: 25645844 PMCID: PMC4356765 DOI: 10.1128/aac.04614-14] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 01/25/2015] [Indexed: 01/12/2023] Open
Abstract
A total of 84,704 isolates were collected from 191 medical centers in 2009 to 2013 and tested for susceptibility to ceftaroline and comparator agents by broth microdilution methods. Ceftaroline inhibited all Staphylococcus aureus isolates at ≤2 μg/ml and was very active against methicillin-resistant strains (MIC at which 90% of the isolates tested are inhibited [MIC90], 1 μg/ml; 97.6% susceptible). Among Streptococcus pneumoniae isolates, the highest ceftaroline MIC was 0.5 μg/ml, and ceftaroline activity against the most common Enterobacteriaceae species (MIC50, 0.12 μg/ml; 78.9% susceptible) was similar to that of ceftriaxone (MIC50, ≤0.25 μg/ml; 86.8% susceptible).
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Mendes RE, Sader HS, Flamm RK, Farrell DJ, Jones RN. Telavancin activity when tested by a revised susceptibility testing method against uncommonly isolated Gram-positive pathogens responsible for documented infections in hospitals worldwide (2011–2013). J Glob Antimicrob Resist 2015; 3:36-39. [DOI: 10.1016/j.jgar.2014.12.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 12/16/2014] [Accepted: 12/20/2014] [Indexed: 11/15/2022] Open
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Stryjewski ME, Jones RN, Corey GR. Ceftaroline: clinical and microbiology experience with focus on methicillin-resistant Staphylococcus aureus after regulatory approval in the USA. Diagn Microbiol Infect Dis 2015; 81:183-8. [PMID: 25583130 DOI: 10.1016/j.diagmicrobio.2014.11.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Revised: 10/24/2014] [Accepted: 11/23/2014] [Indexed: 01/12/2023]
Abstract
Ceftaroline fosamil was approved in 2010 by the United States Food and Drug Administration (USA-FDA) for the treatment of patients with acute bacterial skin and skin structure infections (ABSSSIs) and community-acquired bacterial pneumonia (CABP). After approval, several studies and case reports have described the postmarketing clinical experience with ceftaroline in ABSSSIs and CABP and in patients with invasive methicillin-resistant Staphylococcus aureus (MRSA) infections, many of whom had failed prior antibiotics. Successful clinical outcomes observed among the majority of these patients were supported by preapproval and postapproval in vitro surveillance of ceftaroline activity using breakpoint criteria that have been harmonized between the USA-FDA and CLSI. MIC90 values/percentage of strains susceptible to ceftaroline has remained stable over the period 2009-2012. Taken together, these postapproval studies support the use of ceftaroline for ABSSSI as well as CABP. Importantly, these data also suggest that ceftaroline can be effective in patients with serious invasive MRSA infections who have failed other therapies.
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Pfaller MA, Castanheira M, Messer SA, Jones RN. In vitroantifungal susceptibilities of isolates ofCandidaspp. andAspergillusspp. from China to nine systemically active antifungal agents: data from the SENTRY antifungal surveillance program, 2010 through 2012. Mycoses 2015; 58:209-14. [DOI: 10.1111/myc.12299] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 01/10/2015] [Indexed: 11/28/2022]
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Yu WL, Winokur PL, Jones RN, Sader HS. Surveillance in Taiwan Using Molecular Epidemiology for Extended-Spectrum Beta-Lactamase-ProducingKlebsiella pneumoniae. Infect Control Hosp Epidemiol 2015; 25:812-8. [PMID: 15518021 DOI: 10.1086/502301] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractObjective:To evaluate intrahospital and interhospital clonal dissemination of extended-spectrum beta-lactamase (ESBL)-producing strains ofKlebsiella pneumoniae.Setting:Eight tertiary-care university hospitals and 16 regional hospitals in Taiwan.Methods:Two hundred eleven confirmed ESBL-producing isolates ofK. pneumoniaewere collected from January 1998 to June 2000. The isolates were characterized by various typing methods, including antibiogram (9 antimicrobial agents), computer-based ribotyping, pulsed-field gel electrophoresis (PFGE), and isoelectric focusing of beta-lactamase.Results:Ribotyping identified 70 distinct ribogroups among 200 isolates evaluated. Forty-three of these ribogroups were unique. Eleven ribogroups, comprising 115 isolates, were detected in more than one hospital (interhospital dissemination), whereas 16 groups (42 isolates) were detected in more than one patient within a hospital (intrahospital dissemination). The combination of ribotyping and PFGE identified two large epidemic clones, which were called 691.5/PFGE-G and 595.7/PFGE-A. These epidemic clones were detected mainly in the hospitals located in the northern and central regions of Taiwan. However, variation of the profiles of antibiograms and isoelectric focusing was apparent within each clone. In addition, isolates with the same isoelectric focusing profile (isoelectric points 7.9, 8.2, and 8.4) and antibiogram (resistance to 9 compounds evaluated) were present among different molecular-typed clones.Conclusions:Our results showed that clonal dissemination (both interhospital and intrahospital dissemination) is occurring in several regions of Taiwan. Rapid computer-based ribotyping associated with PFGE demonstrated multiple epidemic clones of ESBL-producingK. pneumoniaein Taiwan. The combination of phenotypic and molecular methods has proved useful to characterize these epidemic clones.
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Mendes RE, Farrell DJ, Sader HS, Streit JM, Jones RN. Update of the telavancin activity in vitro tested against a worldwide collection of Gram-positive clinical isolates (2013), when applying the revised susceptibility testing method. Diagn Microbiol Infect Dis 2014; 81:275-9. [PMID: 25618421 DOI: 10.1016/j.diagmicrobio.2014.12.011] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 12/18/2014] [Accepted: 12/21/2014] [Indexed: 11/30/2022]
Abstract
A revised broth microdilution susceptibility testing method for telavancin was approved by the Food and Drug Administration (FDA). Telavancin activity was assessed against Gram-positive pathogens collected worldwide (2013) using the revised method. A total of 12,346 isolates from 90 sites were included as part of the Telavancin International Surveillance Program for the Americas, Europe, and Asia-Pacific. Telavancin had MIC50 and MIC90 values of 0.03 and 0.06 μg/mL, respectively, against staphylococci, regardless of methicillin susceptibility, and inhibited all Staphylococcus aureus at ≤0.12 μg/mL (revised FDA breakpoint). Telavancin was 8-fold more active than daptomycin (MIC50/90, 0.25/0.5 μg/mL) and 16- to 32-fold more active than vancomycin (MIC50/90, 1/1 μg/mL) and linezolid (MIC50/90, 1/1 μg/mL) against methicillin-resistant S. aureus. All 692 vancomycin-susceptible Enterococcus faecalis were inhibited by telavancin (MIC50/90, 0.12/0.12 μg/mL) at ≤0.25 μg/mL (FDA breakpoint), except for 1 strain (MIC, 0.5 μg/mL). All Enterococcus faecium and E. faecalis with telavancin MIC values of ≥0.5 and ≥1 μg/mL, respectively, had a VanA phenotype. A comparison data analysis based on the MIC90 demonstrated that telavancin was at least 8-fold more potent than comparators against vancomycin-susceptible enterococci. Streptococci showed telavancin MIC50 values of ≤0.015 μg/mL, except for Streptococcus agalactiae (MIC50, 0.03 μg/mL). These in vitro results obtained by the recently approved susceptibility testing method establish a new benchmark of telavancin activity worldwide.
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Castanheira M, Rhomberg PR, Watters A, Jones RN. 257In Vitro Activity of Meropenem/RPX7009, a Carbapenem/β-lactamase Inhibitor Combination Tested Against Contemporary Populations of Enterobacteriaceae and KPC-producing Strains. Open Forum Infect Dis 2014. [PMCID: PMC5781457 DOI: 10.1093/ofid/ofu052.123] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Castanheira M, Jones RN, Sader HS. 250Ceftazidime-avibactam Activity Tested Against a Large Collection of Enterobacteriaceae Isolates Collected in United States (USA) Hospitals in the 2011-2013 Period, Including Organisms Producing KPC- and CTX-M-variants. Open Forum Infect Dis 2014. [PMCID: PMC5781521 DOI: 10.1093/ofid/ofu052.116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Farrell DJ, Sader HS, Flamm RK, Jones RN. 246Frequency of Occurrence and Antimicrobial Susceptibility of Gram-negative Organisms Isolated from Health Care–Associated (HCA) Urinary Tract Infections (UTI) in the United States: Results from the Program to Assess Ceftolozane/Tazobactam Susceptibility (PACTS). Open Forum Infect Dis 2014. [DOI: 10.1093/ofid/ofu052.112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Farrell DJ, Sader HS, Flamm RK, Jones RN. 245Ceftolozane/Tazobactam Activity Tested against Aerobic Gram-negative Organisms Isolated from Intra-abdominal Infections in United States Hospitals (2013). Open Forum Infect Dis 2014. [DOI: 10.1093/ofid/ofu052.111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Barriere SL, Farrell DJ, Rhomberg PR, Jones RN. Serum inhibitory and bactericidal activity of telavancin in non-infected subjects with severe renal impairment or end-stage renal disease. Diagn Microbiol Infect Dis 2014; 80:327-9. [DOI: 10.1016/j.diagmicrobio.2014.09.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 08/22/2014] [Accepted: 09/01/2014] [Indexed: 11/16/2022]
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Castanheira M, Messer S, Dietrich R, Rhomberg PR, Jones RN, Pfaller M. 1454Antifungal Susceptibility Patterns of a Global Collection of Fungal Isolates and Polysorbate-80 Effect on the Susceptibility of the Antifungal Classes. Open Forum Infect Dis 2014. [PMCID: PMC5781956 DOI: 10.1093/ofid/ofu052.1000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Farrell DJ, Sader HS, Flamm RK, Jones RN. 247Antimicrobial Activity of Ceftolozane/Tazobactam Tested against Gram-negative Bacterial Isolates from Hospitalized Patients with Pneumonia in United States Hospitals (2013). Open Forum Infect Dis 2014. [PMCID: PMC5781369 DOI: 10.1093/ofid/ofu052.113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Castanheira M, Williams G, Jones RN, Sader HS. Activity of ceftaroline-avibactam tested against contemporary Enterobacteriaceae isolates carrying β-lactamases prevalent in the United States. Microb Drug Resist 2014; 20:436-40. [PMID: 24593056 DOI: 10.1089/mdr.2013.0181] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Contemporary (2012) β-lactamase-producing isolates (n=493) from U.S. hospitals were tested against ceftaroline-avibactam. Klebsiella spp., Escherichia coli and Proteus mirabilis isolates displaying the Clinical and Laboratory Standards Institute (CLSI) screening criteria for extended spectrum β-lactamase (ESBL) production were evaluated. Isolates carried genes encoding CTX-M (n=316, CTX-M-14-like and -15-like), KPC (n=45), CMY-2-like (n=54), or SHV enzyme with ESBL activity (n=78). Ceftaroline-avibactam inhibited 98.2% of the isolates at ≤0.5 μg/mL, and all strains were inhibited by ≤2 μg/mL of this novel β-lactamase-inhibitor combination. These results confirm that ceftaroline-avibactam could be a useful therapeutic option for Enterobacteriaceae isolates producing β-lactamases that are prevalent in the United States.
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Jones RN, Mendes RE, Castanheira M. Regional pooling of national data from a small number of sites can be misleading: maybe yes? But data can be complimentary to other studies and valuable to infectious disease physicians! Diagn Microbiol Infect Dis 2014; 80:91-2. [DOI: 10.1016/j.diagmicrobio.2014.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Accepted: 05/03/2014] [Indexed: 10/25/2022]
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Rennie RP, Jones RN. Effects of breakpoint changes on carbapenem susceptibility rates of Enterobacteriaceae: Results from the SENTRY Antimicrobial Surveillance Program, United States, 2008 to 2012. THE CANADIAN JOURNAL OF INFECTIOUS DISEASES & MEDICAL MICROBIOLOGY = JOURNAL CANADIEN DES MALADIES INFECTIEUSES ET DE LA MICROBIOLOGIE MEDICALE 2014; 25:285-7. [PMID: 25371693 PMCID: PMC4211354 DOI: 10.1155/2014/265981] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the absence of clinical resistance, breakpoints for many antimicrobial agents are often set high. Clinical failures following use of the agents over time requires re-evaluation of breakpoints. This is based on patient response, pharmacokinetic/pharmacodynamic information and in vitro minimal inhibitory concentration data. Data from the SENTRY Antimicrobial Surveillance Program has shown that Clinical and Laboratory Standards Institute breakpoint changes for carbapenems that occurred between 2008 and 2012 in North America have resulted in decreased levels of susceptibility for some species. In particular, reduced susceptibility to imipenem was observed for Proteus mirabilis (35%) and Morganella morganii (80%). Minor decreases in susceptibility were also noted for Enterobacter species with ertapenem (5%) and imipenem (4.3%), and Serratia species with imipenem (6.4%). No significant decreases in susceptibility were observed for meropenem following the breakpoint changes. There were no earlier breakpoints established for doripenem. Very few of these Enterobacteriaceae produce carbapenamase enzymes; therefore, the clinical significance of these changes has not yet been clearly determined. In conclusion, ongoing surveillance studies with in vitro minimum inhibitory concentration data are essential in predicting the need for breakpoint changes and in identifying the impact of such changes on the percent susceptibility of different species.
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Flamm RK, Jones RN, Sader HS. In vitro activity of ceftaroline tested against isolates from the Asia-Pacific region and South Africa (2011). J Glob Antimicrob Resist 2014; 2:183-189. [DOI: 10.1016/j.jgar.2014.02.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 12/20/2013] [Accepted: 02/12/2014] [Indexed: 11/17/2022] Open
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Sader HS, Farrell DJ, Flamm RK, Jones RN. Ceftolozane/tazobactam activity tested against aerobic Gram-negative organisms isolated from intra-abdominal and urinary tract infections in European and United States hospitals (2012). J Infect 2014; 69:266-77. [DOI: 10.1016/j.jinf.2014.04.004] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 04/19/2014] [Indexed: 12/18/2022]
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Castanheira M, Jones RN, Sader HS. Activity of ceftaroline and comparator agents tested against contemporary Gram-positive and -negative (2011) isolates collected in Europe, Turkey, and Israel. J Chemother 2014; 26:202-10. [PMID: 24070006 DOI: 10.1179/1973947813y.0000000135] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
The activity of ceftaroline was tested against 8233 isolates mainly collected from bloodstream, urinary, respiratory and skin and soft tissue specimens in European medical centers during 2011. This cephalosporin displayed activity against Staphylococcus aureus (MIC(50), 0·25 mg/l), with greater activity against MRSA (MIC(50), 1 mg/l) than other β-lactams tested. Against Streptococcus pneumoniae, including penicillin-resistant strains, other streptococcal groups and Haemophilus spp., ceftaroline was highly active and MIC90 values ranged from ≤0·015 to 0·12 mg/l. Ceftaroline, like other cephalosporins, had limited activity against ESBL-phenotype Enterobacteriaceae, but showed good activity against isolates not displaying an ESBL-phenotype. Ceftaroline remains very active against MRSA and other organisms than could be associated with its approved indications in the EU (complicated skin and soft tissue infections and community-acquired pneumonia).
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Mendes RE, Biek D, Critchley IA, Farrell DJ, Sader HS, Jones RN. Decreased ceftriaxone susceptibility in emerging (35B and 6C) and persisting (19A) Streptococcus pneumoniae serotypes in the United States, 2011-2012: ceftaroline remains active in vitro among β-lactam agents. Antimicrob Agents Chemother 2014; 58:4923-7. [PMID: 24867974 PMCID: PMC4136078 DOI: 10.1128/aac.02976-14] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Accepted: 05/17/2014] [Indexed: 11/20/2022] Open
Abstract
Totals of 8.7% (103/1,190) and 21.0% (249/1,190) of the Streptococcus pneumoniae isolates recovered from specimens collected in the United States during the 2011-2012 AWARE (Assessing Worldwide Antimicrobial Resistance Evaluation) Surveillance Program were ceftriaxone nonsusceptible according to the CLSI (≤ 1 μg/ml for susceptible) and EUCAST (≤ 0.5 μg/ml for susceptible) criteria, respectively. Decreased susceptibility to ceftriaxone (MIC, 1 μg/ml) was frequently observed among serotypes 19 A (51.4%; 128/249) and 35 B (29.7%; 74/249), which were most often observed in the East South Central and South Atlantic U.S. Census regions. Ceftaroline (MIC50/90, 0.12/0.25 μg/ml) remained active (≥ 96.8% susceptible) when tested against these less susceptible isolates.
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