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Journal Article
Research Support, Non-U.S. Gov't
Antimicrobial susceptibility patterns and distribution of blaOXA genes among Acinetobacter spp. Isolated from patients at Tehran hospitals.
Japanese Journal of Infectious Diseases 2008 July
Multiple drug-resistant strains of Acinetobacter have created therapeutic problems worldwide. This study was conducted to determine the antimicrobial susceptibility patterns and prevalence of bla(OXA-type) carbapenemases among isolates of Acinetobacter spp. obtained from Iranian patients. Here, 128 Acinetobacter isolates were identified at the species level, and their susceptibilities to different antibiotics were determined using disk agar diffusion testing. Isolates were then subjected to multiplex-PCR targeting bla(OXA) genes. More than 50% of the isolates showed multidrug resistance to different antibiotics. The rates of susceptibility to imipenem, meropenem, piperacillin-tazobactam, and amikacin were 50.7, 50, 42.1, and 38.2%, respectively. The MICs of carbapenems for the resistant isolates ranged from 64 to > or = 256 microg/ml. All strains of Acinetobacter baumannii possessed a bla(OXA-51-like) gene. The co-existence of bla(OXA-51-like)/bla(OXA-23-like) and bla(OXA-51-like)/bla(OXA-24-like) was detected in 25% (n=32) and 17.9% (n=23) of the isolates, respectively. Over 70% of carbapenem-resistant strains contained at least two genes encoding OXA-type carbapenemase. Resistance to carbapenems in the population of Acinetobacter strains in Iran is high, with the majority of isolates showing multidrug resistance. A wide diversity of OXA genes exists among the strains of A. baumannii in Iran. Detection of bla(OXA-51-like) can be used as a simple and reliable method to differentiate A. baumannii strains from other species.
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