Swine-pox
Pigs of 2 months of age may be infected with vaccinia either naturally or artificially and show pox lesions on the eyelids, snot, inside the thigh and undersurface of the abdomen. The virus of vaccinia may produce an abortive type of pox or may grade up to a severe type. The disease is caused by a virus entity that produces inclusion bodies. The virus is transmitted by rubbing an infected pig against scarified skin, by lice and less often by other insects and simple contact. Swine immune to vaccinia are fully susceptible to swine-pox and vice versa. An attack of the disease renders the affected animals immune. This may account for the fact that swine-pox is rather rarely seen in aged animals. Immunization is not generally practical. The elimination of lice probably would do a great deal to control the disease. Swine-pox is transmitted commonly between swine by the bite of pig louse (Hematopinus suis). The virus does not replicate in louse.