Prevalence of IBR, PI 3, BRS and BCV infections in the dairy cattle population of New Zealand

Infectious bovine rhinotracheitis (IBR), parainfluenza type 3 (PI 3), bovine respiratory syncytial (BRS) and bovine coronavirus (BCV) infections are common viral diseases of cattle (Anon, 1990 Anon Dairy Statistics 1995-1996 Livestock Improvement Corporation Limited, 1996 [Google Scholar]). IBR, PI 3 and BRS viruses have all been incriminated as causes of bovine respiratory disease (Anon, 1990 Anon Dairy Statistics 1995-1996 Livestock Improvement Corporation Limited, 1996 [Google Scholar]). BCV is one of the agents that causes diarrhoea and occasionally respiratory tract infections of calves and is associated with winter dysentery in adult cattle (Wege et al., 1982 Wege, H,, Siddell, S, and Termeulen, V. 1982. The bilogy and pa.thogenesis of coronaviruses. Current Topics in Microbiology and Immunology, 99: 165–200. [PubMed] , [Google Scholar]).