<unk> s are the most frequent bacterial<unk>  in women. They occur most frequently between the ages of 16 and 35years, with 10% of women getting an<unk>  yearly and more than 40–60% having an<unk>  at some point in their lives. Recurrences are common, with nearly half of people getting a second<unk>  within a year.<unk> s occur four times more frequently in females than males. Pyelonephritis occurs between 20 and 30 times less frequently. They are the most common cause of hospital-acquired<unk> s accounting for approximately 40%. Rates of asymptomatic bacteria in the urine increase with age from two to seven percent in women of child-bearing age to as high as 50% in elderly women in care homes. Rates of asymptomatic bacteria in the urine among men over 75 are between 7–10%. Asymptomatic bacteria in the urine occurs in 2% to 10% of pregnancies.<unk> s may affect 10% of people during childhood. Among children,<unk> s are most common in uncircumcised males less than three months of age, followed by females less than one year. Estimates of frequency among children, however, vary widely. In a group of children with a fever, ranging in age between birth and two years, two to 20% were diagnosed with a<unk> .
Urinary tract infection
Vaginitis
Ureteral neoplasm
Interstitial cystitis
Pyelonephritis
Pelvic inflammatory disease
Urinary bladder disease
Urethritis