Viral respiratory infections of cattle

Abstract

The viruses isolated from respiratory diseases of cattle can be classified as to their virulence. One group consists of viruses that, after infection without any environmental influences, lead to severe clinical disease. Viruses of the other group act mostly as precursors for other agents, sometimes also viruses, the best example being parainfluenza 3 virus. A number of vaccines are available for prophylactic and emergency vaccinations against most of the severe and, to a lesser extent, for the other viruses.