| tuberculosis, bovine | An infection of cattle caused by mycobacterium bovis. It is transmissible to man and other animals. (12 Dec 1998) |
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| lentiviruses, bovine | A subgenus of lentivirus comprising viruses that produce multi-organ disease with long incubation periods in cattle. (12 Dec 1998) |
| leukaemia virus, bovine | The type species of HTLV-blv viruses that causes a form of bovine lymphosarcoma (enzootic bovine leukosis) or persistent lymphocytosis. (12 Dec 1998) |