The major etiologic agent of urinary tract infections is:
a. E. coli.
b. Shigella spp.
c. Salmonella spp.
d. Vibrio spp.
A
For those species that normally colonize humans, infections may result when a patient's own bacterial strains (i.e., endogenous strains) establish infections in a normally sterile body site. These organisms can also be passed from one patient to another. Such infections often depend on the debilitated state of a patient who is hospitalized and are nosocomially acquired. However, this is not always the case. For example, although E. coli is the most common cause of noso-comial infections, it is also the leading cause of urinary tract infections in nonhospitalized pa-tients.
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