Uropathogenic Escherichia coli are more likely than commensal E. coli to be shared between heterosexual sex partners.
Because uropathogenic Escherichia coli are better adapted than other E. coli to the urethra, periurethra, and vagina, the authors reasoned that uropathogenic E. coli would be more likely than commensal E. coli to be shared between sex partners. In this 1996-1999 Michigan study, the genetic identity of E. coli isolated from 166 women with E. coli urinary tract infection (UTI) and 94 women without UTI and their sex partners was determined by pulsed-field gel electrophoresis. Rectal isolates were considered uropathogenic E. coli if genetically identical to the urinary isolate causing UTI. All eight urinary isolates from men with UTI partners were identical to the E. coli found in the urine or vagina of their sex partner. When the 550 unique rectal E. coli isolates from couples were considered the unit of analysis, E. coli that caused UTI were nine times (odds ratio (OR) = 8.87, 95% confidence interval (CI): 5.41, 14.54) more likely than other E. coli to be shared between sex partners. Sharing occurred twice as frequently (OR = 1.87, 95% CI: 1.13, 3.08) if the E. coli had P pili or if the couples engaged in oral sex (OR = 2.09, 95% CI: 1.09, 4.00). Uropathogenic E. coli are more likely than commensal E. coli to be shared with a current heterosexual sex partner. Both sexual behaviors and a bacterial virulence factor, P pili, modified sharing.
Foxman
Betsy
B
Center for Molecular and Clinical Epidemiology, Department of Epidemiology, The University of Michigan School of Public Health, Ann Arbor 48109, USA. bfoxman@umich.edu
Manning
Shannon D
SD
Tallman
Patricia
P
Bauer
Richard
R
Zhang
Lixin
L
Koopman
James S
JS
Gillespie
Brenda
B
Sobel
Jack D
JD
Marrs
Carl F
CF
D000222:Adaptation, Physiological; D000293:Adolescent; D000328:Adult; D004926:Escherichia coli / Q000472:pathogenicity*; D004927:Escherichia coli Infections / Q000382:microbiology / Q000635:transmission*; D005260:Female; D006801:Humans; D008297:Male; D016017:Odds Ratio; D018570:Risk Assessment; D012749:Sexually Transmitted Diseases; D014552:Urinary Tract Infections / Q000382:microbiology / Q000635:transmission*