TY - JOUR
T1 - High tigecycline resistance in multidrug-resistant Acinetobacter baumannii
AU - Navon-Venezia, Shiri
AU - Leavitt, Azita
AU - Carmeli, Yehuda
PY - 2007/4
Y1 - 2007/4
N2 - Objectives: Multidrug-resistant (MDR) Acinetobacter baumannii is increasing in our hospital and worldwide, raising the necessity of finding effective therapies. We aimed to evaluate the in vitro activity of tigecycline against MDR A. baumannii clones isolated before tigecycline was used in our institution. Methods: Eighty-two unique patient clinical isolates of multidrug-resistant A. baumannii collected in 2003 were studied. Species identification and antibiotic susceptibilities were determined by Vitek-2. Tigecycline MIC was determined by Etest. Clonal relatedness was determined by PFGE. Results: MDR A. baumannii possessed 19 different pulsotypes. Sixty-six percent of the isolates were resistant to tigecycline, 12% were intermediate and 22% were susceptible. The MIC50 and MIC90 of tigecycline were 16 and 32 mg/L, respectively, with a wide MIC range of 1-128 mg/L. Variability in MIC of tigecycline was evident between and within the same pulsotype. Conclusions: We report here high resistance rates to tigecycline, and higher than previously described MICs, in multiple clones of MDR A. baumannii. As tigecycline represents a new treatment choice for infections caused by A. baumannii, these findings are worrisome.
AB - Objectives: Multidrug-resistant (MDR) Acinetobacter baumannii is increasing in our hospital and worldwide, raising the necessity of finding effective therapies. We aimed to evaluate the in vitro activity of tigecycline against MDR A. baumannii clones isolated before tigecycline was used in our institution. Methods: Eighty-two unique patient clinical isolates of multidrug-resistant A. baumannii collected in 2003 were studied. Species identification and antibiotic susceptibilities were determined by Vitek-2. Tigecycline MIC was determined by Etest. Clonal relatedness was determined by PFGE. Results: MDR A. baumannii possessed 19 different pulsotypes. Sixty-six percent of the isolates were resistant to tigecycline, 12% were intermediate and 22% were susceptible. The MIC50 and MIC90 of tigecycline were 16 and 32 mg/L, respectively, with a wide MIC range of 1-128 mg/L. Variability in MIC of tigecycline was evident between and within the same pulsotype. Conclusions: We report here high resistance rates to tigecycline, and higher than previously described MICs, in multiple clones of MDR A. baumannii. As tigecycline represents a new treatment choice for infections caused by A. baumannii, these findings are worrisome.
KW - Antibiotic resistance
KW - Etest
KW - Glycylcyclines
KW - MDR multiple clones
UR - http://www.scopus.com/inward/record.url?scp=34249977996&partnerID=8YFLogxK
U2 - 10.1093/jac/dkm018
DO - 10.1093/jac/dkm018
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C2 - 17353223
AN - SCOPUS:34249977996
SN - 0305-7453
VL - 59
SP - 772
EP - 774
JO - Journal of Antimicrobial Chemotherapy
JF - Journal of Antimicrobial Chemotherapy
IS - 4
ER -