title: A natural outbreak of Newcastle disease in pigeons in the Sudan.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D010856:Columbidae / Q000382:microbiology; D004196:Disease Outbreaks / Q000662:veterinary*; D006385:Hemagglutination Inhibition Tests / Q000662:veterinary; D009521:Newcastle Disease / Q000175:diagnosis / Q000453:epidemiology*; D013397:Sudan