Figure 2.

PFGE profiles of the non-repeated Escherichia coli strains of different antibiotic susceptibility profiles that isolated from preterm infants during hospitalization.

Notes: Stool samples were collected in 3 timepoints, namely D1: day 1 (meconium); D7: day 7, and D14: day 14. However, E. coli was not isolated from the meconium samples. Majority of the strains were of pulsotype ECXbal I. Putative ESBL producers were indicated with *. CLSI recommended breakpoints for screening of E.coli and K. pneumoniae by disk diffusion for ESBL producers confirmatory test are lower than the CLSI published disk diffusion breakpoints for resistance. Thus, many isolates that have been categorized as susceptible may be considered as putative ESBL producers.