The Bacillus Of Swine-Erysipelas (Rouge da pore) is apparently identical with the above. It has the same appearances and reactions, and shows the same pathogenic relations to the house mouse and field mouse. The disease occurs spontaneously in the higher breeds of pigs, the more ordinary breeds being almost insusceptible to inoculation. The affected animals present a red.eruption of the skin; there are signs of progressive weakness, and death occurs in one or two days. The bacilli are found in the blood-vessels in all parts of the body, but also in the tissues outside the vessels.

A vaccine of this form was obtained by Pasteur by passing the microbe through rabbits. Immunity was procured in pigs by successive vaccinations with weaker and stronger cultures.