title: Source of avian influenza virus in Oxfordshire uncertain.
mesh_terms: D000818:Animals; D002645:Chickens; D004196:Disease Outbreaks / Q000662:veterinary; D004739:England / Q000453:epidemiology; D009980:Influenza A virus / Q000145:classification / Q000302:isolation & purification / Q000472:pathogenicity*; D005585:Influenza in Birds / Q000453:epidemiology*