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Role of Parainfluenza-3 in Cattle

Eli Lilly and Company, Greenfield, Indiana 46140

ABSTRACT

The occurrence of Myxovirus parainfluenza-3 (PI-3) in cattle has been well documented (1, 2, 11, 13, 18, 20, 28). This organism plays an important role in the bovine respiratory complex. Current investigations indicate that respiratory diseases of cattle are due to the interactions of viruses, bacteria, and other factors.

To date, the viruses isolated in the United States and throughout the world appear related. Some minor strain differences in immunodiffusion reactions have been observed; however, all the viruses reported have been related by cross neutralization and hemagglutination inhibition tests (23, 27). That only a single homotypic virus has been found is favorable for development of vaccines.

Parainfluenza-3 virus has been isolated from aborted fetuses (29), from milk (22), and from the testicles of an infertile bull (9). Since PI-3 virus can be involved in abortion and its occurrence in milk, its consideration as a pathogen in dairy cattle is necessary.