The major etiologic agent of urinary tract infections is

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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 hospitalized patient and are nosocomially acquired. However, this is not always the case. For example, although Escherichia coli is the most common cause of nosocomial infections, it is also the leading cause of urinary tract infections in nonhospitalized patients.

The Major Etiologic Agent of Urinary Tract Infections Is