A field outbreak caused by bovine respiratory syncytial virus.

Bovine respiratory syncytial virus (BRSV) caused a large epizootic of acute respiratory disease in Japan in 1968—69 1970, 1972). A much smaller outbreak occurred in Switzerland 1970). In Belgium the virus has been isolated from an outbreak of respiratory disease 1970). BRSV has later been proved an important causal agent of respiratory disorders in the same country 1975). In England and USA the virus has caused and been isolated from outbreaks of acute respiratory disease in calves 1971, 1974, 1974). In Denmark BRSV has sporadically been isolated from pneumonic calf lungs 1976).