PREVENTION, SYMPTOMS AND TREATMENT g 5 



culiar form of eczema caused by the ingestion of potato pulp in 

 quantities greater than 60 lbs. daily. This attacks the limbs with 

 stiffness, redness, swelling, exudation, crusting, etc., and general 

 failure of condition. 



Treatment. — The treatment for the acute and chronic forms of 

 eczema in the ox is identical with that in the horse. In that form 

 in which total loss of hair threatens, the tar preparations in alcohol 

 are advisable. In that produced by potato pulp, change to sound 

 food of hay and grain, with local treatment adapted to the condi- 

 tion as indicated above, will secure recovery. 



Edema, Malignant — Gangrenous Septicemia. 



This is an acute, specific infection due to inoculation of B. 

 oedematis maligni — a slender, spore-bearing, motile anaerobe, 

 occurring in soils, foul water and in the intestines of animals. 

 The disease attacks horses, cattle, sheep, swine, dogs, cats, goats, 

 poultry and man. 



The bacillus enters through local inoculation by accidental 

 wounds, or by surgical operations — shearing, docking, castration, 

 parturition, etc. The disease begins as a doughy, painful, crepi- 

 tating swelling which spreads rapidly. The centre is soft, jelly- 

 like and gangrenous; the margin of the tumor is tender, tense and 

 hot to the touch. If the infection starts in an open wound there is a 

 stinking, frothy discharge owing to the development of gas. 



The disease is difficult to distinguish from black quarter. 

 The history of local wound and the presence of a fetid discharge 

 favors the diagnosis of malignant edema, but inoculation of rabbits 

 is the best test. Rabbits succumb to the malignant edema bacillus, 

 but are not killed by inoculation with blackleg virus. From anthrax 

 malignant edema differs in not showing the post mortem changes 

 of tarry blood and enlarged spleen seen in anthrax. 



Prevention and Treatment. — The preventive treatment consists 

 chiefly in the avoidance of soil infection of wounds and in thorough 

 cleansing of wounds and disinfection, as with hydrogen dioxide, 



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