Abstract
In two experiments in which 31 calves were used, a bovine herpesvirus 1 subunit vaccine previously shown to elicit a strong immunological response in adult cattle failed to do so in younger animals and failed to protect against pneumonia caused by sequential exposure to virulent bovine herpesvirus 1 and Pasteurella haemolytica aerosols. One of the experimental groups had been previously inoculated with a live commercial vaccine but even this failed to elicit a strong immunological response. These results indicate that the calves were in a refractory state when immunized and may explain why similar vaccine failures occur in the field.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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