HERPES— RINGWORM 265 



is thickened and creviced. If diffuse and of long duration 

 emaciation follows. It is difficult to find the mites under the 

 microscope, as they are limited in numbers. 



Treatment. — The skin should be thoroughly scrubbed with 

 green soap and water to soften the crusts. This may be 

 followed by the use of sulphur ointment, creolin liniment, or 

 a tar salve. 



Follicular Mange. — Occurrence. — This form of mange, 

 which is common in dogs, where it assumes two forms, 

 the squamous and the pustular, is rare in other animals, with 

 the possible exception of the pig. 



Etiology. ^-The hair follicle mites, Acarus folliculorum, live 

 in the sebaceous glands and hair follicles. Following their 

 invasion pus cocci enter, leading to abscess formation. In 

 swine the Demodex folliculorum (var. suis) is the offender. 

 The region of the snout, neck, ventral portion of the chest, 

 the abdomen and inner parts of the thighs are the favorite 

 seats. In these regions pox-like pustules to hazel-nut-sized 

 boils or abscesses as large as walnuts appear. In the centre 

 of an abscess hundreds of the mites may be found. 



Diagnosis. — Diagnosis depends upon finding the mites 

 under the microscope. 



Prognosis. — The prognosis in swine is not good, as the dis- 

 ease is very obstinate. An operative treatment which con- 

 sists in removing the affected skin is recommended. 



HERPES. RINGWORM. 



Definition. — A contagious skin disease due to a fungus and 

 characterized by the formation of round, sharply defined 

 ■ areas covered with scales and short uneven hair stumps. 



Occurrence. — Ringworm is very common in cattle, especially 

 during the winter season, when they are stabled. It is some- 

 times, therefore, known as "barn itch." While more or 

 less troublesome it is a benign disease. Horses are also 

 affected with it, as are sheep and pigs. 



Etioloyg. — Ringworm is caused by the fungus Trichophyton 

 tonsurans. This fungus is made up of threads (hyphse) 



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