FIG. 3.

Biofilm formation of selected ABU and CA-ABU E. coli isolates on Foley latex catheters. Catheter sections were incubated with isolates in human urine, and biofilm formation was assessed via colony counting. Biofilm formation as the number of CFU per 1-cm catheter section was standardized to that of ABU E. coli strain 83972. The results are the averages of at least duplicates, with error bars indicating standard deviations. The four CA-ABU isolates which had significantly higher levels of biofilm growth than ABU E. coli 83972 are marked with asterisks (P < 0.05). The corresponding amount of biofilm growth for each strain on PVC microtiter plates is also indicated and expressed as either low (−), medium (+), or high (++).