title: Infectious bursal disease immunisation failures in chickens in Nigeria.
mesh_terms: D000818:Animals; D002645:Chickens; D007114:Immunization; D007243:Infectious bursal disease virus / Q000276:immunology*; D009017:Morbidity; D009549:Nigeria; D011201:Poultry Diseases / Q000453:epidemiology / Q000276:immunology*; D012087:Reoviridae / Q000276:immunology*; D012088:Reoviridae Infections / Q000453:epidemiology / Q000276:immunology / Q000662:veterinary*