title: The isolation and some biological properties of a variant avian infectious bronchitis virus.
abstract: A virus isolated from a respiratory disease in chickens was identified as infectious bronchitis virus (IBV). By serum neutralisation tests the virus was shown to be serologically distinct from the Massachusetts type but to possess a one-way relationship with the Connecticut type. Experimentally, it caused a relatively mild respiratory disease in baby chicks. Vaccination of young chicks with H-120 Massachusetts IBV vaccine afforded a high degree of protection against challenge with the isolate. Some problems relating to the isolation and classification of field strains of IBV are briefly discussed.
mesh_terms: D000818:Animals; D001991:Bronchitis / Q000382:microbiology / Q000517:prevention & control / Q000662:veterinary*; D002645:Chickens; D003332:Coronaviridae / Q000302:isolation & purification*; D001351:Infectious bronchitis virus / Q000276:immunology / Q000302:isolation & purification*; D011201:Poultry Diseases / Q000382:microbiology* / Q000517:prevention & control; D014611:Vaccination / Q000662:veterinary; D014765:Viral Vaccines; D014777:Virus Diseases / Q000382:microbiology / Q000517:prevention & control / Q000662:veterinary
chemical_list: D014765:Viral Vaccines