Sporozoa3-Dermatuses iu the Dog. Scabies. 929 



cavity breaks open and then the bristles lie free on the surface 

 of the skin and nestle there in spiral form. Otherwise the skin 

 does not show any pathological changes. 



_ A watery, reddish turbid fluid escapes from the opened 

 vesicles, and at the same time a brownish thick mass which 

 shows a concentric structure like an onion, together with one 

 or several rolled up bristles ; under the microscope flattened epi- 

 dermis cells are seen in the pressed out contents, also dark 

 brown globules and small round cells. 



Course. The affection always takes a chronic course and 

 a progressive character. Moreover, once formed, the vesicles 

 are permanent. 



Treatment. Since from the purely local process no injury 

 to the health has so far been noticed, there is scarcely ever any 

 necessity for treatment. Fomentations with soap water or dis- 

 infecting fluids may be undertaken and, besides, the splitting 

 and pressing out of isolated vesicles may be of advantage. 



Literature. Liihe, Cbl. f. Bakt., 1901, XXIX, 693.— Limgershausen, tjber 

 Hypertrichosis localis cystica. Inaug. Diss., 1894. — Olt, A. F. Tk., 1896, XXII, 

 434.— Voirin, Zool. Jalirb., 1900, XIV, 61.— Zschokke, Schw. A., 1890, XXX, 72. 



Sporozoae-Dermatoses in the Dog. Marcone saw repeatedly 

 sporozoffi-dermatoses in dogs, which manifested themselves clinically in 

 two forms. The one form develops always under the clinical picture 

 of acne, bald spots developing at different parts of the body; the skin 

 is swollen in these places, cyanotic and covered with soft, yellowish gray 

 scales. On the edge of these spots small soft swellings arise and on 

 slight pressure a purulent fluid escapes; often, however, pustules are 

 formed which may be as large as a bean. With a gradual increase in 

 size the spots assume a round shape, the openings of the pustules coalesce 

 into short, red, ulcerous grooves, while the skin is thickened. The 

 organism causing the disease is for the present called Dermosporidium 

 canis. 



In the second form irregular bluish red and knobby surfaces ap- 

 pear, in the area of which the skin is covered \dth small glistening 

 silvery scales. On pressure the protuberances discharge a fluid con- 

 taining mucous-like fiocculi. Often fistulous openings are formed, 

 while the skin is thickened and wrinkled. Marcone proposes the name 

 of Coccidium nudum for the causative agent, because it does not possess 

 a cell membrane. (Marcone, Z. f. Infkr., 1908, IV, 5.) 



21. Scabies. Scab. 



{Schdhe, Krdfze [German] ; Gale [French] ; Scahhle, Rogna, 

 [Italian].) 



As scab one designates a contagious skin disease which is 

 caused by the mange mites and manifests itself by intense itching 

 and by a more or less violent eczematous inflammation of the 

 skin. 



Vol. 2-59. 



