642 SCABIES — SCAB — MANGE. 



facial mange of slieep, there ajDpear dry, scaly, branlike patches. After 

 a time the diseased area extends, the wool falls, and the skin becomes 

 dry, thick and wrinkled. The appearance is exactly like that of sarcoptic 

 mange in sheep, the lower part of the head being seldom invaded. The 

 animals lose condition, waste and die of exhaustion. 



Diagnosis. The parasite is readily recognised, and the practitioner, 

 moreover, is often put on his guard by the epizootic character assumed 

 by the disease. 



The prognosis is grave. Walraff declared the mortality in Grisons 

 (Switzerland) to be as high as 20 per cent. 



The treatment is identical with that of psoroptic mange in sheep. 

 After the animals have been sheared and washed with soap, they should 

 be completely immersed in a bath of the character mentioned in con- 

 nection with sheep scab. If only one animal is infected, it may be 

 sufficient to dress it repeatedly with an ointment containing some 

 parasiticide. 



CHORIOPTIC MANGE. 



This form of mange was noted by Delafond in 1854 at the Jardin des 

 Plantes (Paris) in some angora goats, and by Mollereau in 1889. The 

 disease studied by Delafond had invaded both sides of the neck, the eyes, 

 withers, back, loins, and base of the tail. It was characterised by partial 

 loss of hair, the finer hair falling and the coarser remaining in position. 



In Mollereau's case the disease was located in one of the hind pas- 

 terns, and assumed the form of a thickened band, which produced an oede- 

 matous swelling. The chorioptes were discovered in a thick crust formed 

 by the drying on the hair of the discharge due to their punctures. 



Diagnosis. The parasites can easily be found under the crusts, and, 

 once recognised, distinguish the disease from any other infection. 



Treatment. Ointments containing some parasiticide and solutions 

 of sulphu]-et of potassium generally suffice, the disease having little 

 tendency to become generalised. 



MANGE IN THE PIG. 



The pig suffers from one variety only of mange. It was described 

 by Viborg, Gurlt and Spinola, who found a sarcopt in the mange of 

 wild boars in 1847. Hertwig and Gerlach made a similar observation 

 some years later. Delafond in 1857 discovered the sarcopt of mange 

 in the pig. 



Causation. Sarcoptic mange in the pig is due to the presence of 

 Sarcoptes scabici (r. Huis), although the pig may contract (temporarily) 

 the sarcoptic mange of goats. 



Contagion is favoured by poor condition, over-crowding, dirt and bad 

 hygienic surroundings. 



