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Revista Medica Herediana

Print version ISSN 1018-130X


GALVAN, Fiorela et al. Phenotypic and molecular characterization of extended spectrum beta-lactamase producing strains of Escherichia coli in ambulatory patients in Lima, Peru. Rev Med Hered [online]. 2016, vol.27, n.1, pp.22-29. ISSN 1018-130X.

Objective: To determine the phenotypic and genotypic features of extended spectrum beta-lactamase (ESBL) producing strains of Escherichia coli isolated from urine samples of patients attending outpatient services in a private laboratory in Lima, Peru. Methods: 53 E. coli isolates were evaluated using two phenotypic methods: Jarlier and CLSI, the susceptibility profile was performed using the disk diffusion method and the genotypic features were analyzed using PCR for detecting blaCTX-M, blaTEM y blaSHV genes. Results: The 53 ESBL producing strains of E. coli accounted for 16,30% of all E. coli isolates affecting mostly women older than 65 years. High resistant profile to AMP, CEF, CRO (100%), LEV (87%), NOR (92%), CIP, NAL (94%), CXM, CTX (96%), SXT (70%), ATM (75%) and TOB (85%) was observed. High susceptibility to NIT, IPM (100%), AMK (91%) and FOF (73.6%) was observed. The most frequent bla gen was blaCTX-M (55%), followed by blaCTX-M+TEM (24%), blaTEM (13%) and blaSHV (6%). Conclusions: The rate of ESBL producing strains of E. coli was 16.3% and the blaCTX-M gen was the most common gene type. These results provide valuable information for starting empiric antibiotic therapy in this setting.

Keywords : Escherichia coli; beta-Lactamases; urinary tract infection; community.

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