Serological studies of bovine respiratory syncytial virus in feedlot cattle in South Africa.

Serum antibody titres to bovine respiratory syncytial virus were determined in cattle (n = 282). Samples were obtained at various feedlots and were collected in the 1989 and 1990 winter seasons, during the course of investigations into outbreaks of respiratory tract infections in feedlot cattle. Results of the survey revealed an antibody prevalence of 43% to bovine respiratory syncytial virus. Titres ranged from 1:10 to 1:1280 as determined by the indirect fluorescent antibody test. The results also indicate that bovine respiratory syncytial virus is probably widespread in feedlot cattle in South Africa, and that this virus may be a contributing factor in the bovine respiratory complex.