Deaths within a litter of sucking pigs led to a suspicion of hog cholera, but pestiviruses isolated from both dead and live piglets appeared to be bovine viral diarrhoea virus. Persistent viraemia with bovine viral diarrhoea virus was demonstrated in living littermates and also in a bought-in calf, housed in a nearby pen on the same farm. Only two of the littermates survived, both of which had been virus negative and seropositive from the outset of testing. Porcine and bovine virus isolates grew well in calf testicular cells and were neutralised equally by sera collected at the farm from cattle and pigs. However, a comparison by means of their reactivity to monoclonal antibodies showed that they were similar but not identical, and only the porcine isolates grew well in a porcine kidney cell line.
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