Studies on avian infectious bronchitis virus in New Zealand. 2. Properties of four serotypes at a low and a high passage level

Studies on avian infectious bronchitis virus in New Zealand. 2. Properties of four serotypes at a low and a high passage level
Peer reviewed

Abstract

The properties of four serotypes of New Zealand Infectious Bronchitis (IB) virus in the 10th and the 40th to 50th egg passage were. investigated. All viruses were chloroform-sensitive. Three types in the 10th egg passage were inactivated by heating to 56°C within 10 minutes, the fourth one within 30 minutes. The growth curve of all viruses at a low and a high passage level has been determined. On the basis of degree of attenuation and type-distribution in the New Zealand poultry population an isolate of serotype A in the 46th egg passage was selected as being the most suitable seed virus for a New Zealand IB vaccine.

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