DEPILATING THRUSH. 



543 



usually found on the forehead, cheeks, ears, face, abdomen, the 

 external side of the hind legs, in the neighborhood of the claws and 

 on the notch of the auricular concha in the cat. In this animal 

 and the dog St. Cyr has found these scabs split, gray or saffron 

 yellow and of pitchy consistence. At the beginning they are per- 

 forated by some stray hairs which soon fall out. Later their cen- 

 tral depression becomes more marked and they end in exfoliation. 

 The skin is thinned and sometimes bloody upon their surface. In 

 the horse favi may gather in bands the width of a finger. Itching, 

 which is quite intense in the dog, is wanting or almost unobserved 

 in the cat. 



In most cases the course of the affection is rapid, bat its prog- 

 nosis is benign. A cure has been obtained by Siedamgrotzky after 

 eight days of treatment ; according to St. Cyr, cure is not delayed 

 longer than from eight to twelve days, the hair begins to grow again 

 within that time. 



2. Fa vus OF THE CHICKEN : White COMB. The parasitic 

 nature of chicken thrush was discovered almost at the same time 

 by Leisering, Gerlach, and Muller. According to Gerlach, the 

 affection is expressed by whitish spots, resembling mould, which 

 appear upon the comb and ears, become enlarged, and soon entirëly 

 cover these organs, upon which the vegeto-parasitic coating is trans- 

 formed into a thick scabby covering. As a rule, it remains localized 

 upon the comb for several mouths ; later it extends to the head, 

 shoulders, back, and lastly over the whole body. The feathers 

 which are at first erected, become loosened and drop out ; the skin 

 is covered with crustaceous masses. The animals become emaciated 

 and spread an odor of mouldiness ; they may die from exhaustion 

 if the process has been somewhat extended. 



Differential diagnosis. Differentiation between favus and ton- 

 surating thrush is mainly based upon the existence of cups, which 

 in the former disease are principally formed of fungi. The scabs 

 of tonsurating thrush have not this particular form, and the ele- 

 ments of trichophyton are not abundant in it; the sporophoric 

 tubes are much more rare in this affection than m favi. 



Treatment. The treatment is the same as that of tonsurating 

 thrush. After having detached the crusts the parasiticides indicated 

 in that affection are to be used (cresol, sublimate, carbolic acid, 

 iodine, etc.). 



