Avian infectious bronchitis in Hong Kong.
D000818:Animals; D001991:Bronchitis / Q000662:veterinary*; D002645:Chickens; D004196:Disease Outbreaks; D006723:Hong Kong; D009500:Neutralization Tests; D011201:Poultry Diseases / Q000382:microbiology*; D012328:RNA Viruses / Q000302:isolation & purification