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El Garch F, Youala M, Simjee S, Moyaert H, Klee R, Truszkowska B, Rose M, Hocquet D, Valot B, Morrissey I, de Jong A. Antimicrobial susceptibility of nine udder pathogens recovered from bovine clinical mastitis milk in Europe 2015-2016: VetPath results. Vet Microbiol 2020; 245:108644. [PMID: 32456822 DOI: 10.1016/j.vetmic.2020.108644] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 03/05/2020] [Accepted: 03/17/2020] [Indexed: 11/30/2022]
Abstract
VetPath is an ongoing pan-European antimicrobial susceptibility monitoring programme collecting pathogens from diseased cattle, pigs and poultry not recently treated with antibiotics. Non-duplicate isolates (n = 1244) were obtained from cows with acute clinical mastitis in eight countries during 2015-2016 for centrally antimicrobial susceptibility testing according CLSI standards. Among Escherichia coli (n = 225), resistance was high to ampicillin and tetracycline, moderate to kanamycin and low to amoxicillin/clavulanic acid and cefazolin. The MIC50/90 of danofloxacin, enrofloxacin and marbofloxacin were 0.03 and 0.06 μg/mL. For Klebsiella spp. (n = 70), similar results were noted, except for ampicillin and kanamycin. We detected 3.7 % (11/295) Enterobacteriaceae isolates carrying an ESBL/AmpC gene. Staphylococcus aureus (n = 247) and coagulase-negative staphylococci (CoNS; n = 189) isolates were susceptible to most antimicrobials tested except to penicillin (25.1 and 29.1 % resistance). Two S. aureus and thirteen CoNS isolates harboured mecA gene. Streptococcus uberis isolates (n = 208) were susceptible to β-lactam antibiotics (87.1-94.7 % susceptibility), 23.9 % were resistant to erythromycin and 37.5 % to tetracycline. Resistance to pirlimycin was moderate. For Streptococcus dysgalactiae (n = 132) the latter figures were 10.6 and 43.2 %; pirlimycin resistance was low. MIC values for Streptococcus agalactiae, Trueperella pyogenes and Corynebacterium spp. were generally low. This current VetPath study shows that mastitis pathogens were susceptible to most antimicrobials with exceptions of staphylococci against penicillin and streptococci against erythromycin or tetracycline. For most antimicrobials, the percentage resistance and MIC50/90 values among the major pathogens were comparable to that of the preceeding VetPath surveys. This work highlights the high need to set additional clinical breakpoints for antimicrobials frequently used to treat mastitis.
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Moyaert H, de Jong A, Simjee S, Rose M, Youala M, El Garch F, Vila T, Klein U, Rzewuska M, Morrissey I. Erratum: Survey of antimicrobial susceptibility of bacterial pathogens isolated from dogs and cats with respiratory tract infections in Europe: ComPath results. J Appl Microbiol 2019; 127:1594. [PMID: 31606951 DOI: 10.1111/jam.14420] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Miller A, McLeod S, Mathur T, Morrissey I. 694. In vitro Antibacterial Activity of Sulbactam–Durlobactam (ETX2514SUL) Against 121 Recent Acinetobacter baumannii Isolated from Patients in India. Open Forum Infect Dis 2019. [PMCID: PMC6811126 DOI: 10.1093/ofid/ofz360.762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background The incidence of infections caused by multidrug-resistant Acinetobacter baumannii is increasing at an alarming rate in Southeast Asia and other parts of the world. Sulbactam (SUL) has intrinsic antibacterial activity against A. baumannii; however, the prevalence of β-lactamases in this species has limited its therapeutic use. Durlobactam (ETX2514, DUR) is a novel β-lactamase inhibitor with broad-spectrum activity against Ambler class A, C and D β-lactamases. DUR restores SUL in vitro activity against multidrug-resistant A. baumannii. Against >3,600 globally diverse, clinical isolates from 2012–2017, addition of 4 mg/L DUR reduced the SUL MIC90 from >32 to 2 mg/L. SUL-DUR is currently in Phase 3 clinical development for the treatment of infections caused by carbapenem-resistant Acinetobacter spp.The goal of this study was to determine the activity of SUL-DUR and comparator antibiotics (amikacin (AMK), ampicillin-sulbactam (AMP-SUL), cefoperazone-sulbactam (CFP-SUL) and meropenem (MEM)) against A. baumannii isolated from hospitalized patients in India. Methods A total of 121 clinical A. baumannii isolates from multiple hospital settings and infection sources were collected between 2016–2019 from six geographically diverse hospitals in India. Species identification was performed by MALDI-TOF. Susceptibility of these isolates to SUL-DUR (10µg/10µg) and comparator antibiotics was determined by disk diffusion using CLSI methodology and interpretive criteria, except for CFP-SUL, for which resistance was defined using breakpoints from the CFP-SUL package insert. Results As shown in Table 1, resistance of this collection of isolates to marketed agents was extremely high. In contrast, based on preliminary breakpoint criteria, only 11.5% of isolates were resistant to SUL-DUR. Conclusion The in vitro antibacterial activity of SUL-DUR was significantly more potent than comparator agents against multidrug-resistant A. baumannii isolates collected from diverse sites in India. These data support the continued development of SUL-DUR for the treatment of antibiotic-resistant infections caused by A. baumannii. ![]()
Disclosures All authors: No reported disclosures.
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Torumkuney D, Mayanskiy N, Edelstein M, Sidorenko S, Kozhevin R, Morrissey I. Results from the Survey of Antibiotic Resistance (SOAR) 2014-16 in Russia. J Antimicrob Chemother 2019; 73:v14-v21. [PMID: 29659881 DOI: 10.1093/jac/dky065] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Objectives To determine antibiotic susceptibility in isolates of Streptococcus pneumoniae and Haemophilus influenzae collected in 2014-16 from Russia. Methods MICs were determined by CLSI broth microdilution and susceptibility was assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints. Results A total of 279 S. pneumoniae and 279 H. influenzae were collected. Overall, 67.0% of S. pneumoniae were penicillin susceptible by CLSI oral/EUCAST and 93.2% by CLSI intravenous (iv) breakpoints. All were fluoroquinolone susceptible, with amoxicillin, amoxicillin/clavulanic acid and ceftriaxone susceptibility ≥92.8% by CLSI and PK/PD breakpoints. Isolates showed lower susceptibility to cefuroxime, cefaclor, macrolides and trimethoprim/sulfamethoxazole by CLSI criteria: 85.0%, 76.7%, 68.8% and 67.7%, respectively. Generally, susceptibility was slightly lower by EUCAST criteria, except for cefaclor, for which the difference in susceptibility was much greater. Penicillin-resistant isolates had low susceptibility (≤60%) to all agents except fluoroquinolones. All 279 H. influenzae were ceftriaxone susceptible, 15.4% were β-lactamase positive and ≥97.5% were amoxicillin/clavulanic acid susceptible (CLSI, EUCAST and PK/PD breakpoints). Four isolates were fluoroquinolone non-susceptible by current EUCAST criteria. A major discrepancy was found with azithromycin susceptibility between CLSI (99.3%) and EUCAST and PK/PD (2.2%) breakpoints. Trimethoprim/sulfamethoxazole was poorly active (62.7% susceptible). Conclusions Susceptibility to penicillin (oral), macrolides and trimethoprim/sulfamethoxazole was low in S. pneumoniae from Russia. However, isolates were fully susceptible to fluoroquinolones and ≥92.8% were susceptible to amoxicillin, amoxicillin/clavulanic acid and ceftriaxone. Isolates of H. influenzae only showed reduced susceptibility to ampicillin, cefaclor, clarithromycin and trimethoprim/sulfamethoxazole. Some differences were detected between CLSI, EUCAST and PK/PD breakpoints, especially with cefaclor, cefuroxime and macrolides. These data suggest further efforts are required to harmonize international breakpoints.
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Torumkuney D, Papaparaskevas J, Morrissey I. Results from the Survey of Antibiotic Resistance (SOAR) 2014-16 in Greece. J Antimicrob Chemother 2019; 73:v36-v42. [PMID: 29659884 DOI: 10.1093/jac/dky068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Objectives To determine antimicrobial susceptibility in isolates of Streptococcus pneumoniae and Haemophilus influenzae collected in 2014-16 from patients with community-acquired respiratory tract infections in Greece. Methods MICs were determined by CLSI broth microdilution and susceptibility assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints. Results A total of 99 S. pneumoniae and 52 H. influenzae isolates were collected. Overall, 36.4% of S. pneumoniae were penicillin susceptible by CLSI oral/EUCAST and 88.9% by CLSI intravenous (iv) breakpoints. All were fluoroquinolone susceptible with ≥94% of isolates also susceptible to amoxicillin, amoxicillin/clavulanic acid and ceftriaxone by CLSI and PK/PD breakpoints. Trimethoprim/sulfamethoxazole, cefuroxime, cefaclor and macrolides were less active, with rates of susceptibility of 83.8%, 69.7%, 50.5% and 49.5%, respectively, by CLSI. Generally susceptibility was the same or slightly lower by EUCAST, but the cefaclor difference was much greater. Among H. influenzae, 15.4% of isolates were β-lactamase positive. Susceptibility to amoxicillin/clavulanic acid, ceftriaxone, cefuroxime and the fluoroquinolones was seen in >95% of isolates by CLSI criteria. Susceptibility to azithromycin was seen in 94.2% of isolates using CLSI breakpoints, but clarithromycin susceptibility was lower (61.5%). However, susceptibility to both macrolides was seen in <5% of isolates by PK/PD and EUCAST criteria. Susceptibility to trimethoprim/sulfamethoxazole was seen in 71.2% of isolates. Conclusions Owing to the high prevalence of macrolide resistance among S. pneumoniae and the reduced activity of clarithromycin against H. influenzae, it appears that these agents are not appropriate as monotherapy for community-acquired pneumonia in Greece. Amoxicillin/clavulanic acid, on the other hand, maintained excellent in vitro activity and, as opposed to the similarly effective fluoroquinolones, is safe to use in paediatric patients.
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Torumkuney D, Pertseva T, Bratus E, Dziublik A, Yachnyk V, Liskova A, Sopko O, Malynovska K, Morrissey I. Results from the Survey of Antibiotic Resistance (SOAR) 2014-16 in Ukraine and the Slovak Republic. J Antimicrob Chemother 2019; 73:v28-v35. [PMID: 29659885 DOI: 10.1093/jac/dky069] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Objectives To determine antibiotic susceptibility in isolates of Streptococcus pneumoniae and Haemophilus influenzae collected in 2014-16 from Ukraine and the Slovak Republic. Methods MICs were determined by CLSI broth microdilution and susceptibility was assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints. Results S. pneumoniae isolates collected in Ukraine (n = 100) showed susceptibility rates ≥97% for amoxicillin, amoxicillin/clavulanic acid, penicillin [intravenous (iv) non-meningitis] and fluoroquinolones, between 83% and 86% for oral penicillin, macrolides and cefaclor, and 75% for trimethoprim/sulfamethoxazole. Susceptibility was substantially lower in the Slovak Republic (n = 95). All isolates were susceptible to the fluoroquinolones, but susceptibility to penicillin, amoxicillin, amoxicillin/clavulanic acid, cefuroxime and trimethoprim/sulfamethoxazole varied between 61% and 64%, with only 44% of isolates susceptible to the macrolides. Susceptibility of H. influenzae was more homogeneous, with susceptibility to amoxicillin/clavulanic acid, ceftriaxone, cefuroxime, azithromycin and the fluoroquinolones seen in >90% of isolates by CLSI criteria in both countries. Much greater variability was seen across breakpoints, especially for azithromycin, cefaclor and cefuroxime. The β-lactamase rate was 5.1% (5/98) in the Slovak Republic and 7.3% (7/96) in Ukraine, but the Slovak Republic also had a relatively high rate of β-lactamase-negative-ampicillin-resistant (BLNAR) isolates (7.1%; 7/98). Conclusions The variability found across these two neighbouring countries illustrates the need to monitor and publish national and local resistance patterns. This information is not only critical for effective empirical therapy but can also be used to help shape and support antimicrobial stewardship efforts in order to limit antibiotic resistance.
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Torumkuney D, Nica M, Nistor I, Vatcheva-Dobrevska R, Petrovic V, Stoica A, Hanicar B, Antic D, Morrissey I. Results from the Survey of Antibiotic Resistance (SOAR) 2014-16 in Bulgaria, Romania, Serbia and Croatia. J Antimicrob Chemother 2019; 73:v2-v13. [PMID: 29659882 DOI: 10.1093/jac/dky066] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Objectives To determine antibiotic susceptibility of isolates of Streptococcus pneumoniae (n = 573) and Haemophilus influenzae (n = 345) collected in 2014-16 from Bulgaria, Romania, Serbia and Croatia. Methods MICs were determined by CLSI broth microdilution and susceptibility was assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints. Results Among S. pneumoniae, susceptibility was generally lowest in Romania and Serbia and highest in Bulgaria. Rates of susceptibility to penicillin (CLSI oral or EUCAST) were 22.3% and 21.8% in Romania and Serbia respectively, 57% in Croatia and 86.6% in Bulgaria. Similarly, macrolide susceptibility using CLSI/EUCAST breakpoints was low in Romania and Serbia (∼28% and 34.5%, respectively), higher in Croatia (55.9%) and highest in Bulgaria (∼75%). Only fluoroquinolones were active against all isolates in all four countries. Susceptibility was higher and variability across countries less pronounced for H. influenzae. Susceptibility by CLSI criteria to amoxicillin/clavulanic acid, azithromycin, cefuroxime, ceftriaxone and fluoroquinolones was ≥98% in all countries. Ampicillin susceptibility ranged from 85.3% in Romania to 100% in Bulgaria. Much greater variability was seen across breakpoints. Susceptibility to azithromycin and cefuroxime using CLSI criteria was ≥98% in all four countries, but was 0%-1% by EUCAST criteria. Conclusions The variability in antimicrobial susceptibility using different breakpoints makes it difficult for clinicians to interpret antimicrobial resistance data, and efforts should be made to harmonize breakpoints. The variability found across the four neighbouring countries demonstrates the need to monitor and publish national and local resistance patterns. These findings provide information critical for the selection of appropriate antimicrobial agents for the treatment of S. pneumoniae and H. influenzae.
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Torumkuney D, Zemlickova H, Maruscak M, Morrissey I. Results from the Survey of Antibiotic Resistance (SOAR) 2014-16 in the Czech Republic. J Antimicrob Chemother 2019; 73:v22-v27. [PMID: 29659883 DOI: 10.1093/jac/dky067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Objectives To determine the antibiotic susceptibility of isolates of Streptococcus pneumoniae and Haemophilus influenzae collected in 2014-16 from patients with community-acquired respiratory infections in the Czech Republic. Methods MICs were determined by CLSI broth microdilution and susceptibility was assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints. Results S. pneumoniae isolates (n = 200) showed high rates of susceptibility (>95%) to amoxicillin, amoxicillin/clavulanic acid, penicillin [intravenous (iv) non-meningitis], ceftriaxone, cefuroxime and the fluoroquinolones using CLSI breakpoints. Susceptibility to cefaclor and trimethoprim/sulfamethoxazole was 94%-94.5%, to penicillin (oral) 91.5% and to the macrolides 89.5%. Susceptibility of H. influenzae (n = 197) to amoxicillin/clavulanic acid, ceftriaxone, cefuroxime, azithromycin and the fluoroquinolones was ≥98% by CLSI criteria. Rates of susceptibility to the remaining agents were ≥75% except for clarithromycin at 37.1%. Great variability was seen across breakpoints, especially for the macrolides, cefaclor and cefuroxime (oral), 98.0% of H. influenzae showing susceptibility to the latter by CLSI criteria, 69.5% by PK/PD and 1.5% by EUCAST standards. The β-lactamase rate was 13.7% with no β-lactamase-negative-ampicillin-resistant (BLNAR) isolates by CLSI criteria. Conclusions Antibiotic resistance among the two major respiratory pathogens remained low in the Czech Republic. These findings support local clinicians in continuing the historically restrictive use of antibiotics in the Czech Republic, with selection of narrower-spectrum agents for the empirical therapy of community-acquired respiratory tract infections. This highlights one of the great benefits of continuous surveillance of antimicrobial resistance: knowledge of current local resistance patterns reduces the need to choose broad-spectrum agents that contribute to increasing resistance worldwide.
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Morrissey I, Cantón R, Vila J, Gargallo-Viola D, Zsolt I, Garcia-Castillo M, López Y. Microbiological profile of ozenoxacin. Future Microbiol 2019; 14:773-787. [DOI: 10.2217/fmb-2019-0089] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: To explore the antibacterial spectrum of ozenoxacin and compare its in vitro activity with that of other antibacterial agents. Materials & methods: In 2010, 10,054 isolates were collected from 128 centers worldwide. Minimum inhibitory concentrations against Gram-positive and Gram-negative isolates were determined for 23 and 13 antibacterial agents, respectively. Results: Ozenoxacin exhibited high in vitro activity against susceptible, and methicillin- or levofloxacin-resistant, Gram-positive bacteria. Ozenoxacin was one or two dilutions less active against Enterobacteriaceae isolates, except for Escherichia coli, than other quinolones. Conclusion: Ozenoxacin is a potent antimicrobial agent mainly against susceptible and resistant strains of Gram-positive isolates (staphylococci and streptococci), and shows activity against some Gram-negative isolates.
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Moyaert H, de Jong A, Simjee S, Rose M, Youala M, El Garch F, Vila T, Klein U, Rzewuska M, Morrissey I. Survey of antimicrobial susceptibility of bacterial pathogens isolated from dogs and cats with respiratory tract infections in Europe: ComPath results. J Appl Microbiol 2019; 127:29-46. [PMID: 30955231 DOI: 10.1111/jam.14274] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 03/30/2019] [Accepted: 04/03/2019] [Indexed: 12/26/2022]
Abstract
AIMS To present antimicrobial susceptibilities for bacteria from dogs and cats with respiratory tract infection (RTI) across Europe in 2013-2014 and compare with data from 2008-2010. METHODS AND RESULTS Minimal inhibitory concentrations were determined for 464 isolates following Clinical and Laboratory Standards Institute standards using antibiotics approved for RTI treatment. Where possible, susceptibility was calculated using predominantly human-derived breakpoints whilst some antibiotics had no breakpoints. The main pathogen from dogs was Staphylococcus pseudintermedius which was > 90% susceptible to fluoroquinolones and oxacillin (92·5%; six isolates confirmed mecA-positive) and 53·8, 80·0 and 88·8% susceptible to tetracycline, penicillin and trimethoprim/sulfamethoxazole. Streptococci, Escherichia coli, Bordetella bronchiseptica, Staphylococcus aureus and Pseudomonas aeruginosa were also present in dog RTI. Streptococci were fully susceptible to penicillin, ampicillin and pradofloxacin. None were enrofloxacin-resistant but 31·4% had intermediate susceptibility. The least active agent against streptococci was tetracycline (51·4% susceptible). For E. coli, 90·9% were amoxicillin/clavulanic acid-susceptible; susceptibility to other compounds ranged from 63·6 to 81·8%. There are no breakpoints for B. bronchiseptica and Ps. aeruginosa. For Staph. aureus, penicillin susceptibility was low (34·8%); for other compounds 87·0-100%. The main RTI pathogen from cats was Pasteurella multocida, where only pradofloxacin has breakpoints (100% susceptible). Susceptibility of coagulase-negative staphylococci ranged from 66·7% (penicillin) to 97·2% (pradofloxacin). Streptococci from cats were 100% susceptible to all antibiotics except enrofloxacin and tetracycline (both 65·2% susceptible). CONCLUSIONS Overall, antimicrobial resistance was low to medium in RTI in dogs and cats, although susceptibility varied widely among pathogens studied. SIGNIFICANCE AND IMPACT OF THE STUDY Responsible use of antibiotics is crucial to maintain susceptibility and continued resistance monitoring is important to support this goal. These findings support the need for the setting of RTI-specific breakpoints for pathogens of dogs and cats.
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Okujava R, Garcia-Alcalde F, Haldimann A, Zampaloni C, Morrissey I, Magnet S, Kothari N, Harding I, Bradley K. 1359. Activity of Meropenem/Nacubactam Combination Against Gram-Negative Clinical Isolates: ROSCO Global Surveillance 2017. Open Forum Infect Dis 2018. [PMCID: PMC6252560 DOI: 10.1093/ofid/ofy210.1190] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Background Nacubactam (NAC, OP0595, RG6080) is a novel member of the diazabicyclooctane inhibitor family with a dual mode of action, acting as a β-lactamase inhibitor and an antibacterial agent by means of PBP2 inactivation. NAC restores and extends the activity of β-lactam antibiotics, such as meropenem (MEM), when used in combination against a variety of carbapenem-resistant Enterobacteriaceae (CRE). The first year results of the ROSCO surveillance study for MEM/NAC against contemporary clinical isolates are presented here. Methods Isolates (n = 4,695) collected in 2017 from 50 sites in the United States and European hospitals included 30 different species of Enterobacteriaceae (EB, n = 3,306), Pseudomonas spp. (n = 960) and Acinetobacter spp. (n = 429). The predominant species of EB are shown in figure below. MICs were determined by broth microdilution following CLSI methodology for MEM/NAC at a fixed 1:1 ratio (w:w) and by titrating MEM with a constant concentration of NAC at 4 mg/L. Results were compared with MIC values of MEM and NAC alone and standard of care antibiotics, including ceftazidime/avibactam (CAZ/AVI). Results MIC50/90 for MEM, NAC, and MEM/NAC against all EB isolates and by species are shown in the figure below. NAC alone displayed a bimodal MIC distribution for EB, with a prominent separation at ≤4 mg/L. MEM/NAC 1:1 inhibited 99.5, 99.7, and 99.9% of the 3,306 EB isolates tested, at ≤2, ≤4, and ≤8 mg/L, respectively; while MEM inhibited 96.5, 96.8, and 97.3% of the isolates at the same concentrations. Of 117 (3.5% of total EB) MEM nonsusceptible (by EUCAST) and multidrug resistant (MDR, by Magiorakos AP, et al., 2012) EB, 87.2, 92.3, and 96.6% were inhibited by MEM/NAC 1:1 at ≤2, ≤4, and ≤8 mg/L, respectively. Additionally, MEM/NAC1:1 displayed MIC ≤8 mg/L for 33 out of 37 CAZ/AVI-resistant MDR EB isolates. MEM/NAC had a similar activity to MEM alone against Pseudomonas spp. and Acinetobacter spp. ![]()
Conclusion MEM/NAC combination shows excellent in vitro activity against current clinical EB isolates and the potential to extend MEM activity to MDR, MEM nonsusceptible and CAZ/AVI-resistant isolates, which supports the continued clinical development of MEM/NAC for infections caused by CREs. This project has been funded in part under HHS BARDA Contract HHSO100201600038C. Disclosures R. Okujava, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland: Employee, Salary. F. Garcia-Alcalde, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland: Employee, Salary. A. Haldimann, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland: Employee, Salary. C. Zampaloni, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland: Employee, Salary. I. Morrissey, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland: Research Contractor, Contracting fee to IHMA. S. Magnet, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland: Research Contractor, Contracting fee to IHMA. N. Kothari, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland: Research Contractor, Contracting fee to IHMA. I. Harding, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland: Research Contractor, Contracting fee to Micron. K. Bradley, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland: Employee, Salary.
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Canton R, Morrissey I, Vila J, Tato M, García-Castillo M, López Y, Gargallo-Viola D, Zsolt I. Comparative in vitro antibacterial activity of ozenoxacin against Gram-positive clinical isolates. Future Microbiol 2018; 13:3-19. [PMID: 29745242 DOI: 10.2217/fmb-2017-0289] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AIM To compare the in vitro activity of the anti-impetigo agent, ozenoxacin, and other antimicrobial agents against Gram-positive clinical isolates from skin and soft tissue infections. MATERIALS & METHODS Isolates were collected in two studies: 1097 isolates from 49 centers during 2009-2010 and 1031 isolates from ten centers during 2014. Minimum inhibitory concentrations were determined for 18 and 11 antimicrobials in these studies, respectively, using standard broth microdilution methods. Isolates were stratified by species and methicillin susceptibility/resistance and/or levofloxacin susceptibility/nonsusceptibility status. RESULTS Ozenoxacin exhibited high in vitro activity against Staphylococcus aureus and coagulase-negative staphylococci isolates in both studies. Ozenoxacin was also highly active against Streptococcus pyogenes and Streptococcus agalactiae isolates. CONCLUSION Ozenoxacin is a potent antimicrobial agent against staphylococci and streptococci.
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Torumkuney D, Pertseva T, Bratus E, Dziublik A, Yachnyk V, Liskova A, Sopko O, Malynovska K, Morrissey I. Results from the Survey of Antibiotic Resistance (SOAR) 2014–16 in Ukraine and the Slovak Republic. J Antimicrob Chemother 2018; 73:2276. [DOI: 10.1093/jac/dky220] [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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Torumkuney D, Nica M, Nistor I, Vatcheva-Dobrevska R, Petrovic V, Stoica A, Hanicar B, Antic D, Morrissey I. Results from the Survey of Antibiotic Resistance (SOAR) 2014–16 in Bulgaria, Romania, Serbia and Croatia. J Antimicrob Chemother 2018; 73:2275. [DOI: 10.1093/jac/dky219] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Morrissey I, Magnet S, Hawser S, Shapiro S, Seifert H, Higgins P. Activity of the Novel Extended-spectrum β-Lactamase Inhibitor AAI101 in Combination with Cefepime Towards a Challenge Panel of Acinetobacter baumannii. Open Forum Infect Dis 2017. [PMCID: PMC5631409 DOI: 10.1093/ofid/ofx163.896] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Background AAI101 is a novel extended-spectrum β-lactamase inhibitor (BLI), active against ESBLs and a broad array of other BLs. AAI101 in combination with cefepime (FEP) is in Phase 2 development. Infections caused by A. baumannii, a pathogen endemic to the southern US and other global regions, are very challenging to treat, and often require combination therapy. This study examined the activity of FEP/AAI101 against a challenge set of A. baumannii clinical isolates enriched with OXA carbapenemase producers. Methods BLs in A. baumannii were identified by genotyping. Broth microdilution MICs and susceptibilities were obtained following CLSI methods and breakpoints (BPs), except for ceftazidime-avibactam (CAZ/AVI) where FDA P. aeruginosa BPs were used. CLSI FEP BPs were used for FEP/AAI101. Results All OXA-51 producers had the ISAba1 promoter. MIC90 data and % susceptibilities (%S) for FEP/AAI101 and comparators are shown in the Table: FEP/AAI101 was highly active against meropenem-susceptible (MPMs) isolates. FEP/AAI101 (AAI101 fixed at 8 µg/ml) covered 67% of OXA-51 and 53% of OXA-58 strains. Lower susceptibilities were obtained for OXA-23 and OXA-24/40 producers. FEP/AAI101 was the most active β-lactam product. Colistin (COL) was the only agent with consistently high activity against all A. baumannii isolates. Conclusion FEP/AAI101 was the most potent β-lactam product tested against clinical isolates of A. baumannii producing OXA-51 and OXA-58 β-lactamases. Infections by this difficult pathogen often require combination therapy, of which FEP-AAI101 may be a component. Disclosures S. Shapiro, Allecra: Employee, Salary
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El Garch F, Kroemer S, Galland D, Morrissey I, Woehrle F. Survey of susceptibility to marbofloxacin in bacteria isolated from diseased pigs in Europe. Vet Rec 2017; 180:591. [DOI: 10.1136/vr.103954] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/04/2017] [Indexed: 11/04/2022]
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Torumkuney D, Gur D, Soyletir G, Gurler N, Aktas Z, Sener B, Tunger A, Bayramoglu G, Koksal I, Yalcin AN, Tanriver Y, Morrissey I, Barker K. Results from the Survey of Antibiotic Resistance (SOAR) 2002-09 in Turkey. J Antimicrob Chemother 2016; 71 Suppl 1:i85-91. [PMID: 27048585 DOI: 10.1093/jac/dkw067] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES To investigate changes in antibiotic susceptibility of Streptococcus pneumoniae and Haemophilus influenzae from the Survey of Antibiotic Resistance (SOAR) in community-acquired respiratory tract infections (CA-RTIs) between 2002 and 2009 in Turkey. METHODS Previously published SOAR data were used for this analysis. MICs were determined using Etest(®) gradient strips or disc diffusion. Susceptibility against a range of antimicrobial agents was assessed using CLSI breakpoints. RESULTS A total of 900 S. pneumoniae isolates were analysed: 2002-03 (n = 75), 2004-05 (n = 301) and 2007-09 (n = 524). Four antibiotics were tested consistently throughout and three showed a statistically significant decrease in susceptibility (P < 0.0001): penicillin (74.7% susceptible in 2002-03; 67.8% in 2004-05; and 47.2% in 2007-09); cefaclor (85.3% in 2002-03; 78.7% in 2004-05; and 53.5% in 2007-09) and clarithromycin (85.3% in 2002-03; 82.7% in 2004-05; and 61.9% in 2007-09). Susceptibility to amoxicillin/clavulanic acid did not significantly change (100% in 2002-03; 98.7% in 2004-05; and 97.7% in 2007-09). A total of 930 H. influenzae isolates were analysed: 2002-03 (n = 133), 2004-05 (n = 379) and 2007-09 (n = 418). Four antibiotics were also consistently tested: ampicillin, amoxicillin/clavulanic acid, clarithromycin and cefaclor. All showed >90% susceptibility, but only cefaclor susceptibility significantly reduced (P < 0.0001) over time (99.2% in 2002-03; 96.3% in 2004-05; and 90.4% in 2007-09). CONCLUSIONS In S. pneumoniae from Turkey, there has been a clear statistically significant reduction in susceptibility to key antibiotics since 2002, but not to amoxicillin/clavulanic acid (or amoxicillin). However, susceptibility in H. influenzae remained stable. Continued surveillance is required to monitor future changes in antibiotic susceptibility for CA-RTI bacteria.
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Soyletir G, Altinkanat G, Gur D, Altun B, Tunger A, Aydemir S, Kayacan C, Aktas Z, Gunaydin M, Karadag A, Gorur H, Morrissey I, Torumkuney D. Results from the Survey of Antibiotic Resistance (SOAR) 2011-13 in Turkey. J Antimicrob Chemother 2016; 71 Suppl 1:i71-83. [PMID: 27048584 DOI: 10.1093/jac/dkw075] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES Data are presented from the Survey of Antibiotic Resistance (SOAR) for respiratory tract infection pathogens collected in 2011-13 from Turkey. METHODS MICs were determined using Etest(®). Susceptibility was assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) interpretive criteria. RESULTS Rates of antibiotic susceptibility were very low among 333 isolates of Streptococcus pneumoniae tested: penicillin 38% using CLSI (oral) and EUCAST breakpoints; erythromycin 51% using CLSI and EUCAST criteria; and cefuroxime 64.6% using CLSI and PK/PD and 46.9% using EUCAST. Of the isolates, >90% were susceptible to amoxicillin/clavulanic acid, ceftriaxone (except using EUCAST criteria: 76%), levofloxacin and high-dose intravenous penicillin. Among 339 Haemophilus influenzae isolates, 6.8% were β-lactamase positive while 9.1% were β-lactamase negative but ampicillin resistant (BLNAR) by CLSI (14.7% by EUCAST) criteria. Amoxicillin/clavulanic acid susceptibility was ∼90% by CLSI (with or without BLNAR adjustment, EUCAST and high-dose PK/PD) but lower, at 82.9%, by EUCAST with BLNAR adjustment. Levofloxacin susceptibility was 96% using all three breakpoints. Dramatic differences in rates of susceptibility, depending on the breakpoints used, were seen for cefaclor [94% by CLSI (86.4% BLNAR adjusted), 23% by PK/PD] and cefuroxime [97% by CLSI (89.1% BLNAR adjusted), 85% by PK/PD, 15% by EUCAST (13.0% BLNAR adjusted)]. Streptococcus pyogenes (n = 222) and Moraxella catarrhalis (n = 40) isolates remained highly susceptible to amoxicillin/clavulanic acid, cephalosporins and levofloxacin, with only erythromycin susceptibility dropping below 95% for S. pyogenes. CONCLUSIONS Overall, amoxicillin/clavulanic acid and levofloxacin were the most active antibiotics based on all three breakpoints against these pathogens. Although susceptibility was not universally low in Turkey, high resistance rates were found in S. pneumoniae and, when using PK/PD and EUCAST breakpoints, in other respiratory pathogens.
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Jamsheer A, Rafay AM, Daoud Z, Morrissey I, Torumkuney D. Results from the Survey of Antibiotic Resistance (SOAR) 2011-13 in the Gulf States. J Antimicrob Chemother 2016; 71 Suppl 1:i45-61. [PMID: 27048582 DOI: 10.1093/jac/dkw064] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES To provide surveillance data on the susceptibility of community-acquired respiratory tract isolates from four Gulf and Near East countries from 2011 to 2013. METHODS MICs were determined using Etests(®) for all antibiotics evaluated except erythromycin, where testing was by disc diffusion. Susceptibility was assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints. RESULTS Seven hundred and twenty-six respiratory isolates comprising 265 isolates of Streptococcus pneumoniae, 125 isolates of Streptococcus pyogenes and 336 isolates of Haemophilus influenzae were collected from Bahrain, Lebanon, Oman and the United Arab Emirates (UAE). Among S. pneumoniae, susceptibility to penicillin was low in the UAE and Bahrain. Macrolide susceptibility was ∼45%-60% in the UAE and Oman but higher in Lebanon (73.7%) and Bahrain (84%-85%). Penicillin susceptibility using CLSI intravenous breakpoints was >85% in all countries. Antibiotic susceptibility of S. pneumoniae was lower in UAE and Oman. Among S. pyogenes isolates, resistance to erythromycin was highest in Oman (31.6%) but <20% in the other countries. In H. influenzae, susceptibility to most antibiotics was high, except for ampicillin in Lebanon (70.2%) and amoxicillin in Oman (95.4%). Lebanon also had a high percentage (14.9%) of β-lactamase-positive isolates with non-susceptibility to ampicillin. Amoxicillin/clavulanic acid susceptibility was >95% in all countries. Use of EUCAST versus CLSI breakpoints demonstrated profound differences for cefaclor and cefuroxime in S. pneumoniae and H. influenzae, with EUCAST showing lower susceptibility. CONCLUSIONS There was considerable variability in susceptibility among countries in the same region. Thus, continued surveillance is necessary to track future changes in antibiotic resistance.
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Torumkuney D, Chaiwarith R, Reechaipichitkul W, Malatham K, Chareonphaibul V, Rodrigues C, Chitins DS, Dias M, Anandan S, Kanakapura S, Park YJ, Lee K, Lee H, Kim JY, Lee Y, Lee HK, Kim JH, Tan TY, Heng YX, Mukherjee P, Morrissey I. Results from the Survey of Antibiotic Resistance (SOAR) 2012-14 in Thailand, India, South Korea and Singapore. J Antimicrob Chemother 2016; 71 Suppl 1:i3-19. [PMID: 27048580 DOI: 10.1093/jac/dkw073] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES To provide susceptibility data for community-acquired respiratory tract isolates of Streptococcus pneumoniae, Streptococcus pyogenes, Haemophilus influenzae and Moraxella catarrhalis collected in 2012-14 from four Asian countries. METHODS MICs were determined using Etest(®) for all antibiotics except erythromycin, which was evaluated by disc diffusion. Susceptibility was assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints. For macrolide/clindamycin interpretation, breakpoints were adjusted for incubation in CO2 where available. RESULTS Susceptibility of S. pneumoniae was generally lower in South Korea than in other countries. Penicillin susceptibility assessed using CLSI oral or EUCAST breakpoints ranged from 21.2% in South Korea to 63.8% in Singapore. In contrast, susceptibility using CLSI intravenous breakpoints was much higher, at 79% in South Korea and ∼95% or higher elsewhere. Macrolide susceptibility was ∼20% in South Korea and ∼50%-60% elsewhere. Among S. pyogenes isolates (India only), erythromycin susceptibility (∼20%) was lowest of the antibiotics tested. In H. influenzae antibiotic susceptibility was high except for ampicillin, where susceptibility ranged from 16.7% in South Korea to 91.1% in India. South Korea also had a high percentage (18.1%) of β-lactamase-negative ampicillin-resistant isolates. Amoxicillin/clavulanic acid susceptibility for each pathogen (PK/PD high dose) was between 93% and 100% in all countries except for H. influenzae in South Korea (62.5%). CONCLUSIONS Use of EUCAST versus CLSI breakpoints had profound differences for cefaclor, cefuroxime and ofloxacin, with EUCAST showing lower susceptibility. There was considerable variability in susceptibility among countries in the same region. Thus, continued surveillance is necessary to track future changes in antibiotic resistance.
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Kacou-Ndouba A, Revathi G, Mwathi P, Seck A, Diop A, Kabedi-Bajani MJ, Mwiti W, Anguibi-Pokou MJ, Morrissey I, Torumkuney D. Results from the Survey of Antibiotic Resistance (SOAR) 2011-14 in the Democratic Republic of Congo, Ivory Coast, Republic of Senegal and Kenya. J Antimicrob Chemother 2016; 71 Suppl 1:i21-31. [PMID: 27048579 DOI: 10.1093/jac/dkw070] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES To assess antibiotic susceptibility of community-acquired respiratory tract isolates from Ivory Coast, Kenya, Democratic Republic of Congo (DRC) and Senegal in 2011-14. METHODS Bacterial isolates were collected and MICs determined using Etest(®) for all antibiotics except erythromycin, for which testing was by disc diffusion. Susceptibility was assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints. For macrolide interpretation, CLSI breakpoints were adjusted for incubation in CO2. RESULTS Susceptibility to penicillin (using CLSI oral or EUCAST breakpoints) was low among isolates of Streptococcus pneumoniae from the DRC and Kenya (17.4% and 19%, respectively) but higher among isolates from the Ivory Coast (70%) and Senegal (85.7%). Penicillin susceptibility using CLSI iv breakpoints was higher in all countries, but still only 69.6% in the DRC. Macrolide susceptibility (based on CLSI erythromycin disc diffusion breakpoints) was also low in Kenya (∼65%) but 87%-100% elsewhere. Haemophilus influenzae were only collected in the DRC and Senegal, with β-lactamase prevalence of 39% and 4%, respectively. Furthermore, β-lactamase-negative ampicillin-resistant (BLNAR) isolates were found in DRC (four isolates, 17%), but only two isolates were found in Senegal (by EUCAST definition). Amoxicillin/clavulanic acid in vitro susceptibility was 73.9% in the DRC and 100% in Senegal based on CLSI breakpoints, but this reduced to 65.2% in the DRC when BLNAR rates were considered. Clarithromycin susceptibility was >95% in both countries. CONCLUSIONS There was considerable variability in antibiotic susceptibility among the African countries participating in the surveillance programme. Thus, continued surveillance is necessary to track future changes in antibiotic resistance. Use of EUCAST versus CLSI breakpoints showed profound differences for cefaclor and ofloxacin against S. pneumoniae, with EUCAST showing lower susceptibility.
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Zafar A, Hasan R, Nizamuddin S, Mahmood N, Mukhtar S, Ali F, Morrissey I, Barker K, Torumkuney D. Antibiotic susceptibility in Streptococcus pneumoniae, Haemophilus influenzae and Streptococcus pyogenes in Pakistan: a review of results from the Survey of Antibiotic Resistance (SOAR) 2002-15. J Antimicrob Chemother 2016; 71 Suppl 1:i103-9. [PMID: 27048578 DOI: 10.1093/jac/dkw076] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES To investigate changes in the antibiotic susceptibility of Streptococcus pneumoniae, Haemophilus influenzae and Streptococcus pyogenes from the Survey of Antibiotic Resistance (SOAR) in community-acquired respiratory tract infections (CA-RTIs) between 2002 and 2015 in Pakistan. METHODS This is a review based on previously published studies from 2002-03, 2004-06 and 2007-09 and also new data from 2014-15. Susceptibility was determined by Etest(®) or disc diffusion according to CLSI and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints. RESULTS A total of 706 isolates from CA-RTIs comprising 381 S. pneumoniae, 230 H. influenzae and 95 S. pyogenes were collected between 2002 and 2015 and tested against a range of antibiotics. Antibiotic resistance in S. pneumoniae rose steeply from 2002 to 2009, with isolates non-susceptible to penicillin and macrolides increasing from 10% to 34.1% and from 13%-14% to 29.7%, respectively. Susceptibility to amoxicillin/clavulanic acid (and by inference amoxicillin) remained between 99.4% and 100% from 2002 to 2015. Over the years, the prevalence of susceptibility to cefuroxime was 98%-100% among S. pneumoniae. Resistance in S. pneumoniae to some older antibiotics between 2007 and 2009 was high (86.8% for trimethoprim/sulfamethoxazole and 57.2% for tetracycline). Between 2002 and 2015, ampicillin resistance (β-lactamase-positive strains) among H. influenzae has remained low (between 2.6% and 3.2%) and almost unchanged over the years (H. influenzae was not tested during 2004-06). For S. pyogenes isolates, macrolide resistance reached 22%; however, susceptibility to penicillin, amoxicillin/clavulanic acid and cefuroxime remained stable at 100%. CONCLUSIONS In S. pneumoniae from Pakistan, there has been a clear reduction in susceptibility to key antibiotics since 2002, but not to amoxicillin/clavulanic acid (amoxicillin) or cefuroxime. However, susceptibility in H. influenzae has remained stable. Local antibiotic susceptibility/resistance data are essential to support informed prescribing for CA-RTIs and other infections.
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Hu F, Zhu D, Wang F, Morrissey I, Wang J, Torumkuney D. Results from the Survey of Antibiotic Resistance (SOAR) 2009-11 and 2013-14 in China. J Antimicrob Chemother 2016; 71 Suppl 1:i33-43. [PMID: 27048581 DOI: 10.1093/jac/dkw065] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES To compare antibiotic susceptibility of community-acquired respiratory bacteria in China during 2009-11 and 2013-14. METHODS Susceptibility was determined by Etest(®) (bioMérieux) or disc diffusion according to CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints, except for azithromycin where Etest(®) breakpoints (in CO2 incubation) were used in place of standard CLSI breakpoints. Statistical significance of differences in susceptibility across time periods was evaluated using Fisher's exact test. RESULTS During 2009-11, 434 Streptococcus pneumoniae, 307 Haemophilus influenzae and 140 Moraxella catarrhalis were collected from eight centres and during 2013-14, 208 S. pneumoniae, 185 H. influenzae and 80 M. catarrhalis were collected from five centres. Penicillin-non-susceptible isolates remained stable at ∼66% over both time periods but susceptibility decreased significantly for amoxicillin/clavulanic acid (or amoxicillin) and cefaclor. For H. influenzae, the proportion of β-lactamase-positive isolates and β-lactamase-negative ampicillin-resistant strains (CLSI definition) was higher in 2013-14 (25.4% and 7.0%, respectively) than in 2009-11 (16.3% and 3.6%, respectively), with decreased ampicillin and cephalosporin susceptibility. By 2009-11 and 2013-14, only amoxicillin/clavulanic acid (amoxicillin), levofloxacin, penicillin (intravenously) and chloramphenicol inhibited >70% of S. pneumoniae. During 2013-14, M. catarrhalis showed increasing resistance, with cefaclor and levofloxacin susceptibility decreasing significantly. However, amoxicillin/clavulanic acid, cefuroxime and levofloxacin continued to inhibit >90% of isolates. CONCLUSIONS On the whole, antimicrobial susceptibility decreased in China between 2009-11 and 2013-14. In 2013-14, amoxicillin/clavulanic acid, levofloxacin and chloramphenicol were the most active antibacterial agents tested against community-acquired respiratory pathogens when assessed by CLSI, EUCAST or PK/PD breakpoints. Resistance to other antibacterials in China was generally high. Our data demonstrate the need to harmonize breakpoints for these pathogens.
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Van PH, Binh PT, Minh NHL, Morrissey I, Torumkuney D. Results from the Survey of Antibiotic Resistance (SOAR) 2009-11 in Vietnam. J Antimicrob Chemother 2016; 71 Suppl 1:i93-102. [PMID: 27048586 DOI: 10.1093/jac/dkw069] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES To investigate the susceptibility of respiratory tract infection pathogens collected between 2009 and 2011 from the SOAR study in Vietnam. METHODS MICs were determined using Etest(®) and susceptibility was assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints. RESULTS Two hundred and eighty-nine Streptococcus pneumoniae and 195 Haemophilus influenzae were collected from 11 centres. Overall, 4.8% of S. pneumoniae were penicillin susceptible (CLSI oral and EUCAST breakpoints). Using CLSI intravenous breakpoints, 86.9% were penicillin susceptible. Susceptibility to high-dose amoxicillin/clavulanic acid (or amoxicillin) using PK/PD breakpoints, cefuroxime (using CLSI or PK/PD breakpoints), cefaclor (CLSI breakpoint) and azithromycin (CLSI breakpoint) was 96.9%, 18.7%, 8% and 4.2%, respectively. Ofloxacin susceptibility was 93.4% by CLSI but 0% by EUCAST. All S. pneumoniae were fully vancomycin susceptible. S. pneumoniae from children were significantly less susceptible to most antimicrobials than those from the elderly. For ofloxacin, however, the reverse was true.Among H. influenzae isolates, 40.5% produced β-lactamase and 13.8% were β-lactamase negative but ampicillin resistant (BLNAR) by CLSI. H. influenzae were highly susceptible (97.4%) in vitro to amoxicillin/clavulanic acid and also to ceftriaxone by CLSI and PK/PD breakpoints but not EUCAST breakpoints. However, BLNAR isolates should be considered clinically resistant, with susceptibility reduced to 84.1%. With EUCAST breakpoints, amoxicillin/clavulanic acid susceptibility was lower, at 63.1%. Azithromycin susceptibility was 79.5% (CLSI). CONCLUSIONS Resistance to antibacterials in Vietnam was high, with amoxicillin/clavulanic acid being the most active agent. Ceftriaxone was highly active against H. influenzae while ofloxacin appeared highly active against S. pneumoniae using CLSI but not by EUCAST breakpoints. Ongoing surveillance through SOAR will further assist in understanding susceptibility trends over time.
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Bassetti M, Corey R, Doi Y, Morrissey I, Grossman T, Olesky M, Scoble P, Sutcliffe J. In Vitro Global Surveillance of Eravacycline and Comparators Against Staphylococcus spp. and Enterococcus spp. Over a 3-Year Period (2013–2015). Open Forum Infect Dis 2016. [DOI: 10.1093/ofid/ofw172.1368] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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