title: Leads from the MMWR. Outbreak of hemorrhagic colitis--Ottawa, Canada.
mesh_terms: D000368:Aged; D003092:Colitis / Q000453:epidemiology*; D004196:Disease Outbreaks / Q000453:epidemiology*; D006471:Gastrointestinal Hemorrhage / Q000453:epidemiology; D006707:Homes for the Aged; D006801:Humans; D009864:Ontario