In 80-90% of cases of uncomplicated cystitis, Escherichia coli (E. coli) is involved. This bacteria is present in 70-95% of both upper and lower UTIs. Other common pathogens are Enterococcus faecalis, Klebsiella species, Proteus species and yeast.
The largest group of patients with UTIs is adult women. Women are more prone to UTIs than men because in females, the urethra is much shorter and closer to the anus.
The occurrence of UTI also varies with age. The incidence of UTI is ten times higher in adolescent girls as compared with boys and this continues throughout adult life.
Other predisposing factors include:
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