Epidemiological investigation showed significant bacteriuria (10 ^ 5 organisms / ml urine) at 1 to 4% girl students, 5 to 10% in women of childbearing age, and about 25% of women whose age exceeds 60 years (Papper, 1978), but only a few cases which showed clinical symptoms of urinary tract infection and nephritis.
However, further research is done on the long term of school age girls said that girls who have had bacteriuria will be even more susceptible to urinary tract infection and replication nephritis in adult life, usually not long after marriage or during first pregnancy (Kunin, 1987).
Although urinary tract infection and nephritis is responsible for the morbidity is quite high, but rarely result in nephritis and end-stage renal disease, except in cases of illness was not accompanied by real urologic damage in childhood - usually reflux severe vesi-koureter . Infection in men is rare, and when there are usually caused by obstruction.