Milk of dairy cows frequently contains a leukemogenic virus

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Science  28 Aug 1981:
Vol. 213, Issue 4511, pp. 1014-1016
DOI: 10.1126/science.6267692


Milk or viable milk cells collected from 24 dairy cattle naturally infected with bovine leukemia virus were inoculated into lambs, which were subsequently examined for the development of infection. With this bioassay, infectious virus was demonstrated in the milk of 17 of the cows. Bovine leukemia virus is leukemogenic in at least two mammalian species, is widespread in commercial dairy herds, and can infect a wide range of hosts in vivo and cells, including human cells, in vitro.