Who is at the greatest risk for developing a urinary tract infection (UTI)?

The 20-year-old sexually active female is at the greatest risk for developing a urinary tract infection (UTI) due to several factors associated with female anatomy and sexual activity. Women have a shorter urethra compared to men, which allows bacteria to enter the bladder more easily. Sexual activity can introduce bacteria into the urinary tract, making sexually active women particularly vulnerable to UTIs. Additionally, younger women generally have higher estrogen levels, which can influence the vaginal flora and potentially increase the risk of UTIs.

In comparison, while postmenopausal women and those with diabetes also face increased risks for UTIs due to hormonal changes and decreased immune response, the young sexually active female demographic is still statistically more predisposed. Other factors, such as age and sex, contribute to UTI risk, but the combination of being a young female and sexually active is a significant risk factor that places this group at a higher incidence rate for UTIs than the other options presented.