title: VTEC O157 outbreak associated with a farm visitor centre in North Wales--update.
mesh_terms: D000328:Adult; D000383:Agriculture; D000818:Animals; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks / Q000706:statistics & numerical data*; D004927:Escherichia coli Infections / Q000453:epidemiology* / Q000635:transmission; D019453:Escherichia coli O157; D006801:Humans; D014852:Wales / Q000453:epidemiology