title: A prospective study of asymptomatic bacteriuria in sexually active young women.
abstract: BACKGROUND
  Asymptomatic bacteriuria is common in young women, but little is known about its pathogenesis, natural history, risk factors, and temporal association with symptomatic urinary tract infection.
  
  
  METHODS
  We prospectively evaluated 796 sexually active, nonpregnant women from 18 through 40 years of age over a period of six months for the occurrence of asymptomatic bacteriuria (defined as at least 10(5) colony-forming units of urinary tract pathogens per milliliter). The women were patients at either a university student health center or a health maintenance organization. Periodic urine cultures were taken, daily diaries were kept, and regularly scheduled interviews were performed. Escherichia coli strains were tested for hemolysin, the papG genotype, and the ribosomal RNA type.
  
  
  RESULTS
  The prevalence of asymptomatic bacteriuria (the proportion of urine cultures with bacteriuria in asymptomatic women) was 5 percent (95 percent confidence interval, 4 percent to 6 percent) among women in the university group and 6 percent (95 percent confidence interval, 5 percent to 8 percent) among women in the health-maintenance-organization group. Persistent asymptomatic bacteriuria with the same E. coli strain was rare. Symptomatic urinary tract infection developed within one week after 8 percent of occasions on which a culture showed asymptomatic bacteriuria, as compared with 1 percent of occasions when asymptomatic bacteriuria was not found (P<0.001). Asymptomatic bacteriuria was associated with the same risk factors as for symptomatic urinary tract infection, particularly the use of a diaphragm plus spermicide and sexual intercourse.
  
  
  CONCLUSIONS
  Asymptomatic bacteriuria in young women is common but rarely persists. It is a strong predictor of subsequent symptomatic urinary tract infection.
authors.affiliation: Department of Medicine, University of Washington School of Medicine and School of Public Health and Community Medicine, Seattle, USA. hooton@u.washington.edu
authors.forename: T M
authors.initials: TM
authors.lastname: Hooton
authors.forename: D
authors.initials: D
authors.lastname: Scholes
authors.forename: A E
authors.initials: AE
authors.lastname: Stapleton
authors.forename: P L
authors.initials: PL
authors.lastname: Roberts
authors.forename: C
authors.initials: C
authors.lastname: Winter
authors.forename: K
authors.initials: K
authors.lastname: Gupta
authors.forename: M
authors.initials: M
authors.lastname: Samadpour
authors.forename: W E
authors.initials: WE
authors.lastname: Stamm
mesh_terms: D000293:Adolescent; D000328:Adult; D001437:Bacteriuria / Q000150:complications* / Q000453:epidemiology / Q000382:microbiology; D003075:Coitus; D015169:Colony Count, Microbial; D003274:Contraceptive Devices, Female / Q000009:adverse effects; D004926:Escherichia coli / Q000145:classification / Q000302:isolation & purification / Q000472:pathogenicity; D004927:Escherichia coli Infections / Q000209:etiology; D005260:Female; D006801:Humans; D015994:Incidence; D015999:Multivariate Analysis; D015995:Prevalence; D011446:Prospective Studies; D011776:Pyuria / Q000150:complications; D012307:Risk Factors; D012725:Sexual Behavior; D013089:Spermatocidal Agents / Q000009:adverse effects; D014552:Urinary Tract Infections / Q000209:etiology* / Q000382:microbiology
chemical_list: D013089:Spermatocidal Agents