High prevalence of ESBL-producing E. coli phylogroup B2 clinical isolates in northeastern Thailand.

Background: Production of extended-spectrum β-lactamases (ESBLs) is a common resistance mechanism in Enterobacteriaceae, leading to serious hospital-acquired infections. This study aimed to assess phenotypic, phylogenetic, and antibiotic resistance patterns among ESBL-producing Escherichia coli isolates recovered from two rural tertiary hospitals in Thailand.

Results: Among 467 Enterobacteriaceae isolates, E.