The short urethra makes it easier for bacteria from the anus or genital area to reach the bladder. This can happen during such activities as wiping or sexual intercourse. Most infections of the urinary tract are caused this way. Bacteria can also enter the urine through the bloodstream, but this is rare. Elderly women and pregnant women, particularly pregnant women with diabetes or sickle cell trait, have an increased risk of asymptomatic bacteriuria.
Men can also develop asymptomatic bacteriuria.
In older men it is usually due to an enlargement of the prostate gland. Asymptomatic bacteriuria has no obvious symptoms. Your health care provider may examine you and ask you to provide two urine samples about a week apart. The urine samples will be tested for bacteria. You may also have some blood tests.