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Abstract

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 and Brabant. 802, which have been deposited at the Czechoslovak National Collection of Type Cultures of the Institute of Hygiene and Epidemiology under the numbers CNCTC AO 17/81 and CNCTC AO 18/82 and at the Collection Nationale de Cultures de Microorganismes d'Institut Pasteur, under Nos. I-168 and I-202 and combined infectious-bronchitis vaccines derived from the IBV H. 120 or the IBV H. 52 of the Massachusetts type strain together with the novel before-mentioned virus strain; the infectious-bronchitis virus strain itself, and a process for preventing infectious-bronchitis in poultry by vaccination with a vaccine derived from the before-mentioned strains. Preferably, live infectious bronchitis vaccines are prepared, which contain a virus content of at least 10.sup.4..sup.0 EID.sub.50 per dosage of each of the virus strains after freeze drying.

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