Isolation of Enteroviruses from a Herd of Dairy Cattle

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Abstract
A high incidence of enteroviruses isolated by the use of bovine kidney cell cultures has been found in rectal swabs from normally reared calves. The average age at which shedding of viruses could 1st be detected was 7 to 8 wk. In no case were enteroviruses recovered from calves less than 4 wk. of age. Only one of 7 parturient cows was shown to be shedding enteroviruses. Two ether-resistant virus types were identified which differed in serologic specificity, characteristics of plaque formation in bovine kidney cell cultures, and in vitro host range. Neutralization tests performed with typing sera prepared in rabbits demonstrated that a mixture of the 2 virus types was present in certain of the rectal swab samples. The incidence of these virus types could not be correlated with the appearance of clinical signs in these calves.