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KMID : 0921620060360030133
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Journal of Bacteriology and Virology
2006 Volume.36 No. 3 p.133 ~ p.139
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Antimicrobial Resistance and Integrons Found in Commensal Escherichia coli Isolates from Healthy Humans
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Lee Je-Chul
Kang Hee-Young
Oh Jae-Young
Jeong Jae-Ho
Kim Jung-Min
Seol Sung-Yong
Cho Dong-Taek
Lee Yoo-Chul
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Abstract
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The emergence and spread of antimicrobial resistance among the pathogenic and commensal Enterobacteriaceae are of great concern worldwide. We characterized the antimicrobial resistance and integrons found in commensal Escherichia coli from healthy humans in the community. Class 1 integrase (intl1) and class 2 integrase (intl2) genes were identified in 22 (13.3%) and 2 (1.2%) of 165 E. coli isolates, respectively. dfrA17-aadA5 and dfrA1-aadA2 were the most common class 1 integrons. The prevalence of each type of class 1 integron among commensal E. coli isolates during 2001~2003 was similar to that of clinical E. coli isolates from hospital-acquired infections during 1994~1999. The resistant rates of commensal E. coli isolates carrying intl1 to ampicillin, streptomycin, gentamicin, sulfamethoxazole, trimethoprim, chloramphenicol, and tetracycline were significantly higher than those of intl1-negative E. coli isolates (p<0.05). Integrons were directly associated with multidrug resistance in commensal E. coli isolates. It is hypothesized that multidrug-resistant Enterobacteriaceae from hospital-acquired infections are a potential reservoir for integrons associated with resistance genes found in commensal E. coli isolates in the community.
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KEYWORD
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Integron, Commensal fecal flora, Multiresistance, Escherichia coli
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