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Active immunisation of cattle to reduce the intensity and duration of the clinical respiratory signs induced by an infection with BHV-1 and to reduce nasal excretion of field virus.
Onset of immunity: An increase in immunity was demonstrated 4 days after intranasal vaccination and 14 days after intramuscular vaccination of 3 month old seronegative animals.
Duration of immunity: After intranasal administration to 2 week old calves immunity lasts at least until the age of 3-4 months. In the presence of maternally derived antibodies, the protection of the vaccine may not be complete until a second revaccination. This second vaccination should be administered at 3-4 months of age and will result in protective immunity that lasts for at least 6 months. Single intranasal or intramuscular vaccination of 3 months old animals provides protective immunity (reduction of clinical signs and reduction of viral excretion), which was demonstrated via challenge 3 weeks after vaccination. Reduction of viral excretion is maintained for at least 6 months after single vaccination. Revaccination to ensure protection after the initial 6 month protection period has elapsed will result in protective immunity that lasts for 12 months. Specific information: No information is available on the efficacy of the vaccine to prevent a latent wild virus infection or to prevent wild virus re-excretion in the latent carrier.
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