Pathogenicity of avian influenza A viruses.
D000818:Animals; D002645:Chickens; D004531:Eggs; D009175:Mycoplasma Infections / Q000150:complications; D009975:Orthomyxoviridae / Q000472:pathogenicity*; D011201:Poultry Diseases / Q000175:diagnosis / Q000209:etiology*; D012698:Serologic Tests