title: Studies on avian infectious bronchitis virus in New Zealand. II. Properties of four serotypes at a low and a high passage level.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D002645:Chickens; D003332:Coronaviridae / Q000254:growth & development*; D003333:Coronaviridae Infections / Q000382:microbiology / Q000662:veterinary; D001351:Infectious bronchitis virus / Q000254:growth & development*; D009520:New Zealand; D011201:Poultry Diseases / Q000382:microbiology