Outbreak of hemorrhagic colitis--Ottawa, Canada.
D000208:Acute Disease; D000368:Aged; D002170:Canada; D003093:Colitis, Ulcerative / Q000453:epidemiology* / Q000382:microbiology; D004196:Disease Outbreaks / Q000453:epidemiology*; D006801:Humans; D009735:Nursing Homes