title: Isolation of virulent Newcastle disease virus from apparently normal ducks in Nigeria.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis; D004372:Ducks / Q000382:microbiology*; D009521:Newcastle Disease / Q000382:microbiology*; D009522:Newcastle disease virus / Q000302:isolation & purification*; D011201:Poultry Diseases / Q000382:microbiology*
chemical_list: D000914:Antibodies, Viral