Contagious Pustular Dermatitis of Cattle. §95 



work in spite of their illness, the process assumes a very severe 

 character, the inflammation penetrating into the deeper layers ; 

 the corinm dies in places and, after the falling away or removal 

 of the dollar-sized scabs, crater-shaped ulcers make their ap- 

 pearance, which gradually are filled with granulations and 

 finally heal, leaving scars. Moreover, the lymph vessels lead- 

 ing from the inflamed regions swell into hard, sensitive cords, 

 m the immediate neighborhood an edematous infiltration 

 develops, and the regional lymph glands swell or, exceptionally, 

 suppurate. Friedberger saw the disease occur on the legs in 

 connection with an inflammatory swelling of the joints. Finally 

 healing takes place, but in such cases the disease lasts several 

 weeks, and may continue as long as two months. 



Diagnosis. The peculiar localization of the morbid pro- 

 cesses, the pustules forming in groups on the swollen parts of 

 the skin, the absence of itching and the contagious character of 

 the affection, which can in all cases be proved by experimental 

 inoculation, are distinctive features of the disease, and distin- 

 guish it from the intense itching eczema, further from acne, 

 and also from the galls caused by saddle and harness, 

 which occur without vesicle formation. At times the disease 

 may arouse suspicions of farcy if the affection exceptionally 

 develops on the extremities, if edematous swelling occurs in the 

 region of the exanthema, and if further also inflammation of 

 the lymph vessels and ulceration takes place; the presence 

 of pustules and the tendency to healing, and on the other hand 

 microscopical examination or experimental inoculation (Vol. I) 

 will in such cases prevent errors in diagnosis. 



Treatment. The exclusion of sick animals from work, 

 washing the diseased places with a disinfecting fluid (1:1,000 

 corrosive sublimate, 2% carbolic acid, creolin, lysol solution, 

 Burow's solution) or inunctions of a 10% naphthalin, naphthol, 

 or salicylic ointment will generally lead to healing in a short 

 time. 



Sick animals are to be isolated from healthy ones, and the 

 infected harness and cleaning utensils should not be used on 

 healthy horses without previous thorough disinfection. 



Literature. Burke, The Vet., 1886, 69.— Dieckerhoff & Grawitz, V. A., 1885 



CII, 148.— Friedberger, W. f. Tk., 1880, 413.— Goux, Eec, 1843, 807.— Liihrs Z f' 



Vk., 1906, 267.— Schinclelka, O. Vj., 1883, LX, 61.— Siedamgrotzky, S. B., 1883, 

 18.— Trasbot, Bull., 1899, 163. 



Contagious Pustular Dermatitis of Cattle. Lienaux saw a skin inflamma- 

 tion in a tw» year old emaciated heifer caused by Preisz's pseudotuberculosis 

 bacillus. It began with the development of nodules, which in time enlarged from 

 pea to hen-egg size and broke open. The loss of substance which occurred in this 

 manner healed here and there, but in other circular places the skin died, and after 

 its sloughing an ulcer with an intensely red base and covered with thick pus 

 resulted; in its neighborhood the skin was raised a certain distance from the 

 underlying tissue. In the surrounding tissue similar nodes or necrotic spots formed 



