title: Outbreak of Escherichia coli O157 in North Wales.
mesh_terms: D000328:Adult; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D004927:Escherichia coli Infections / Q000453:epidemiology* / Q000382:microbiology* / Q000517:prevention & control / Q000635:transmission; D006801:Humans; D011159:Population Surveillance; D014852:Wales / Q000453:epidemiology