QUESTIONS AND ANSWERS 203 



Give the sjmiptoms, course and treatment of gangrenous dermatitis. 



This disease is generally preceded by swelling, redness and 

 sensitiveness. Then follows discoloration, insensitiveness, putrid 

 odor ; a dry or moist portion of the skin is cast off, revealing a raw, 

 ulcerative surface. 



Course : Progressive, unless properly attended to. May extend 

 deep into the tendons and ligaments or produce fatal septicaemia. 



Treatment: Remove dead parts; apply dry dressings of iodo- 

 form, boric acid or lead preparations. 



Give the cause, symptoms and treatment of urticaria. 



Urticaria is an inflammatory affection of the skin, characterized 

 by a sudden development of a serous infiltration of the papillary 

 bodies and of the malpighian layer of the skin. It often disappears 

 completely after a short time. 



Causes: Digestive derangements, plethora, rich grain feeding, 

 hot weather, intestinal poisons, bites of insects, individual idiosyn- 

 crasy, poisonous plants as poison ivy, etc. 



Symptoms: Sudden eruption; in a few hours a healthy skin 

 becomes covered with a uniform eruption of nodules, or blotches, 

 some of which may coalesce and form large areas. Itching may or 

 may not be present; individual nodules subside to be followed by 

 others. 



Treatment: Saline cathartics, aloes, alkaline diuretics; allay 

 itching by bathing with solutions of sodiimi bicarbonate, phenol or 

 menthol. 



Name the different forms of parasitic skin disease, mentioning the 

 parasite for each form named. 

 Sarcoptic mange, due to sarcoptes scabei. 

 Psoroptic mange, due to psoroptes communis. 

 Symbiotic mange, due to symbiotes communis. 

 Demodectic mange, due to demodex f oUiculorum. 

 Ringworm, due to trycophyton tonsurans. 

 Ox warble, due to larva of hypoderma lineata. 

 Cutaneous coccidiosis, due to coccidia oviforme. 

 Fleas, lice and ticks occasionally burrow under the skin and 

 produce irritation. 



What parasites are known to produce cutaneous epizootics? 



All those mentioned above but more especially the sarcoptidse and 

 demodecidae. 



Give the cause of poultry acariasis in the horse. Give treatment. 



Housing chickens, infested with the chicken mite (dermanyssus 

 gallinse), in or near the stable. The mites become temporary para- 



