| 摘要 |
Infectious bronchitis vaccines for poultry derived from at least a virus strain of a novel serotype of the infectious bronchitis virus (IBV), identified by the internal indication Gelderland. 901, which has been deposited at the Czechoslovak National Collection of Type Cultures of the Institute of Hygiene and Epidemiology under the number CNCTC AO 17/81 and at the Collection Nationale de Cultures de Microorganismes d'Institut Pasteur, under no. I-168; combined infectious-bronchitis vaccines, derived from the IBV H.120 or the IBV H.52 of the Massachusetts type strain in addition to a novel before-mentioned virus strain; the infectious-bronchitis virus strain itself; and a process for preventing of infectious-bronchitis with poultry by vaccination with vaccines, derived from the before-mentoned strains. Preferably live infectious bronchitis vaccines are prepared, which are containing a virus content of at least 10<4>.<0> EID50 pro dosage of each of the virus strains after freeze drying. |
