. Diseases of cattle, sheep, goats and swine. Veterinary medicine. 612 SCABIES—SCAB—MANGE. the eyelids, and is very rare. It is produced l)y the Dcniodci- foU'u-u- lonim var. oris. SARCOPTIC SCAUIES. This scahies has long heen recognised as affecting more especially the head, muzzle, etc. It was mentioned as long ago as the fourteenth century by Jehan de Brie, hut, until Delafond's time, no one recognised that it was caused by an acarus. In 1858 Delafond discovered the parasite in Piedmont sheep. Causation. Formerly, writers on the subject and sheplierds attri- buted this disease to the wounds
. Diseases of cattle, sheep, goats and swine. Veterinary medicine. 612 SCABIES—SCAB—MANGE. the eyelids, and is very rare. It is produced l)y the Dcniodci- foU'u-u- lonim var. oris. SARCOPTIC SCAUIES. This scahies has long heen recognised as affecting more especially the head, muzzle, etc. It was mentioned as long ago as the fourteenth century by Jehan de Brie, hut, until Delafond's time, no one recognised that it was caused by an acarus. In 1858 Delafond discovered the parasite in Piedmont sheep. Causation. Formerly, writers on the subject and sheplierds attri- buted this disease to the wounds and excoriations which sheep receive in passing through brambles, holly, etc., or in rubbing against their racks. The true cause of the disease is the presence under the skin of the Sarcopics scahei var. avis, which passes from sheep to sheep by direct con- tact. The animals attempt to rub against everything about them, even against their neighbours. These para- sites can be transferred from the goat to the sheep, and vice versa. Walraff, Eoloff, Delafond, Gerlach and Eailliet have described cases of in- fection in man, but the disease is rarely more than of a temporar}^ character. Symptoms. This form of scabies affects the head and the parts free from wool. At first the parasites invade the upper lip and the tissues about the nostrils, sometimes, but more rarely, the eyes and ears. They cause the formation of vesicular papules, ac- companied by violent itching. The animal, in rubbing itself, excoriates these papules, which discharge a fluid and soon become covered with yellowish-brown crusts. The disease afterwards invades the face, forehead, jaws, and entire head. The skin becomes wrinkled and the brownish crusts thicker and more abundant. These are fissured and bleeding, and they give the face the appearance of one vast sore. The parasite rarely attacks the region of the elbow, the belly, or the inside of the thigh. The disease never advances in parts covered by wool, a
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectveterin, bookyear1920
