Inactivated viral vaccines.

The antigens are inactivated with formalin or β-propiolactone and suspended in the aqueous phase of an water in oil adjuvant emulsion, in order to enhance a prolonged stimulation of immunity.

The vaccine is intended to stimulate active immunity against Avian Rhinotracheitis virus, against the Massachusetts and D274/D207 serotypes of Infectious Bronchitis virus and against Newcastle disease and Egg Drop Syndrome '76 virus.

An enhanced immune response is obtained when the product is used for booster immunisation after priming the birds with live vaccines, if available, against Infectious Bronchitis, Rhinotracheitis and Newcastle Disease virus. Priming with Egg Drop Syndrome live vaccine is not necessary. The best results will be obtained if vaccination with the inactivated vaccine takes place at least 4 weeks after administration of the live primer.