COWPDX, also known as variola, is an infectious disease of cattle characterized by fever, falling off in the milk yield and the ap pearance of pustules on the teats and udder. The disease ordinarily runs a harmless course and is quite prevalent, especially in the eastern part of the United States. It is not transmitted except by contact. A similar disease affects horses and sheep. As should be well known, the virus obtained from the pustules of cow pox is used in vaccinating man against small pox. This virus produces a mild form of the disease, front which man recovers in a few weeks and is then claimed to be immune.
The disease appears in four to seven days after natural infection, or may evince itself in two or three days as the result of artificial in oculation. The attack causes a slight rise in temperature, which is soon followed by the ap pearance of reddened, inflamed areas, prin cipally upon the teats and udder. These areas expand into nodules containing at first a pale serous fluid and later pus as the disease rens its course. The typical pox pustule is next present. The total duration of the disease covers about 20 days. The fallen scabs and crusts retain their contagious properties and tend to spread the disease if fresh cattle are brought in contact with them. In herds that
receive careful attention the usual treatment consists of the application of softening and disinfecting agents to such vesicles upon the teats as may have become ruptured by the hands of the milker. Carbolized vaseline or iodoform ointment is well suited for this work. In more persistent cases the use of a milking tube is desirable in order to prevent the re peated opening of the pustules during the operation of milking. Washing the sores twice daily with a weak solution of zinc chloride (2/s per cent solution) checks the in flammation and cleanses and heals the parts by its germicidal action. When the udder is hard, swollen and painful, it is well to support it by a bandage and foment frequently with hot water. Milk from affected herds should not be given young children, as in the raw state it exercises a deleterious action on the alimentary canal. (See SMALLPDX; VACCINATION). Consult 'Abridged Agricultural (Vol. III, Washington 1912) ; and Wilcox and Smith, 'Farmer's Cyclopedia of Live (New York 1912) ; 'Farmers (Washington, D. C.).