title: An outbreak of acute bacterial gastroenteritis is associated with an increased incidence of irritable bowel syndrome in children.
abstract: OBJECTIVE
  Acute bacterial gastroenteritis is associated with subsequent post-infectious irritable bowel syndrome (PI-IBS) in adults. Less is known about this relationship in children. In May 2000, contamination of municipal water by Escherichia coli 0157:H7 and Campylobacter species caused a large outbreak of acute gastroenteritis in Walkerton, Ontario. We assessed this association among a cohort of children enrolled in the Walkerton Health Study (WHS).
  
  
  METHODS
  WHS participants who were under age 16 at the time of the outbreak but who reached age 16 during the 8-year study follow-up were eligible for the pediatric PI-IBS study cohort. Eligibility also required no diagnosis of IBS or inflammatory bowel disease before the outbreak and permanent residency in the Walkerton postal code at the time of the outbreak. Validated criteria were used to classify subjects as having had no gastroenteritis (unexposed controls), self-reported gastroenteritis, or clinically suspected gastroenteritis during the outbreak. From 2002 to 2008, standardized biennial interviews used a modified Bowel Disease Questionnaire to diagnose IBS by Rome I criteria. Risk factors for IBS were identified by logistic regression.
  
  
  RESULTS
  In all, 467 subjects were eligible for the pediatric PI-IBS study cohort (47.1% female; mean age 11.6+/-2.44 years at the time of the outbreak). Of these, 305 were exposed to GE (130 clinically suspected and 175 self-reported) and 162 were unexposed controls. The cumulative incidence of IBS was significantly increased among exposed subjects vs. controls (10.5% vs. 2.5%; odds ratio 4.6, 95% confidence interval (1.6, 13.3)). In an unadjusted risk factor analysis, IBS was associated with a shorter time interval from exposure to assessment of IBS symptoms, female gender, diarrheal illness lasting more than 7 days, weight loss >10 lb, and antibiotic use during the outbreak. In adjusted analyses, both female gender and time interval to assessment of IBS symptoms remained independent predictors of PI-IBS.
  
  
  CONCLUSIONS
  Acute bacterial gastroenteritis is associated with subsequent IBS in children as in adults. Risk factors for PI-IBS in children are similar to those identified among adults. Confirmation of these findings in similar cohorts is needed.
authors.affiliation: Division of Gastroenterology, Department of Medicine, and Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, Ontario, Canada.
authors.forename: Marroon
authors.initials: M
authors.lastname: Thabane
authors.forename: Marko
authors.initials: M
authors.lastname: Simunovic
authors.forename: Noori
authors.initials: N
authors.lastname: Akhtar-Danesh
authors.forename: Amit X
authors.initials: AX
authors.lastname: Garg
authors.forename: William F
authors.initials: WF
authors.lastname: Clark
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Collins
authors.forename: Marina
authors.initials: M
authors.lastname: Salvadori
authors.forename: John K
authors.initials: JK
authors.lastname: Marshall
mesh_terms: D000208:Acute Disease; D002169:Campylobacter Infections / Q000453:epidemiology* / Q000382:microbiology; D016123:Campylobacter jejuni / Q000302:isolation & purification; D016009:Chi-Square Distribution; D002648:Child; D004196:Disease Outbreaks; D004926:Escherichia coli / Q000302:isolation & purification; D004927:Escherichia coli Infections / Q000453:epidemiology* / Q000382:microbiology; D005260:Female; D005759:Gastroenteritis / Q000453:epidemiology* / Q000382:microbiology; D006801:Humans; D015994:Incidence; D043183:Irritable Bowel Syndrome / Q000453:epidemiology* / Q000382:microbiology; D016015:Logistic Models; D008297:Male; D009864:Ontario / Q000453:epidemiology; D012307:Risk Factors; D011795:Surveys and Questionnaires