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

Authors: Lohr JE
Publication: New Zealand Veterinary Journal, Volume 25, Issue 3, pp 51-53, Mar 1977
Publisher: Taylor and Francis

Animal type: Avian, Poultry, Production animal
Subject Terms: Clinical pathology, Diagnostic procedures, Immune system/immunology, Viral, Respiratory system, Disease/defect, Infectious disease
Article class: Scientific Article

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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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