Extract Pox lesions on the teats of lactating dairy cows may be caused by any one or three pox viruses, namely pseudo-cowpox virus, the true cowpox virus and vaccinia virus (Cheville and Shey, 1967 Cheville, N. F. and Shey, D. J. 1967. Pseudocowpox in dairy cattle. J. Am. vet. med. Ass., 150: 855–861. [Google Scholar]).
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Carter et al. (1968) studied this question.
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