Veterinarians in this country do not generally recognize the existence of small-pox in the horse. The disease is described by Continental authorities as an eruption on the pasterns, the posterior surface of the joints being chiefly affected. The skin becomes swollen and red, the inflammation extends some distance up the limb, vesicles, or small blisters, followed by pustules, appear and discharge a viscid fluid. A similar eruption appears sometimes in the nose and lips, and also on the mucous membrane of the mouth and nostrils. The disease is admitted to be very rare in this country, and when it does occur it is most probable that it would be mistaken for the disease of the pastern which is known as " grease". Horse-pox is a benign affection, terminating in recovery without treatment in a few weeks.
Experimental and accidental inoculations are said to produce in man an eruption similar to that following the introduction of the vaccine virus, and it is asserted that the disease so conveyed protects the individual from small-pox.