title: An outbreak of mouth ulcers in an institution for mentally retarded persons.
mesh_terms: D004196:Disease Outbreaks / Q000453:epidemiology*; D004812:Epidemiologic Methods; D006801:Humans; D007326:Institutionalization; D008607:Intellectual Disability / Q000150:complications*; D013281:Stomatitis, Aphthous / Q000150:complications / Q000453:epidemiology*