Which organism is most commonly responsible for community-acquired UTIs in healthy women?

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Escherichia coli is the organism most likely to cause a community-acquired UTI in a healthy woman. It lives in the gut as part of the normal flora and then ascends to the urinary tract from the perineal area. E. coli’s virulence factors, especially adhesion molecules like type 1 and P fimbriae, help it attach to the bladder lining and resist being washed out by urine, allowing it to establish infection and trigger the inflammatory symptoms of a urinary tract infection. Because healthy women commonly harbor E. coli in the perineal region and have a relatively short urethra that aids ascent, this organism accounts for the vast majority of uncomplicated community UTIs. The other organisms listed—Enterococcus faecalis, Pseudomonas aeruginosa, and Streptococcus agalactiae—are less typical culprits in healthy, community-acquired cases and are more often linked to catheter-associated, hospital-acquired infections or specific populations.