Rouget, Rothlauf. Red Fever of Swine, etc. 19 



fatal cases, the violet discoloration of the skin may be absent or 

 only a little marked, while in the protracted cases it acquires its 

 greatest extensions and its darkest shades. In the protracted 

 cases too the prostration becomes extreme, the animal may find 

 it impossible to raise himself on his hind limbs, the diarrhoea be- 

 comes profuse, liquid and foetid, the respiration labored, cyanosis 

 sets in and the temperature is reduced below the normal standard. 



In case of recovery, convalescence is usually prompt and com- 

 plete, differing in this from cases of swine plague and hog cholera. 

 The more favorable issue in rouget probably depends on the com- 

 parative integrity of the intestinal mucosa and mesenteric glands, 

 which are subject to slow-healing lesions in swine plague and hog 

 cholera. Slow convalescence is however not uncommon, yet in 

 such cases, the concurrent, speedy and complete recoveries in other 

 animals in the same herd serve to identify the disease as rouget. 



Mortality . The mortality among grown hogs averages eighty 

 percent. 



Morbid Anatomy. The most prominent leision is the general 

 congestion of the capillary blood vessels, and the numerous minute 

 extravasations or petechiae. The skin shows in the red patches 

 a general dilatation of the capillaries which have become at the 

 same time elongated and tortuous, with minute, often microscopic, 

 ruptures and extravasations at frequent intervals. This usually 

 extends to the whole thickness of the cutis, and to a considerable 

 depth in the subcutaneous fat. Where swelling occurred or pit- 

 ting on pressure, a .serous infiltration of the tissues is found. 

 The lymph glands are uniformly enlarged and discolored, of a 

 dark red, almo.st black, color, the congestion and extravasation 

 being extreme in the cortical substance, while the medullary is 

 paler, .soft and cellular. The lungs are usually gorged with black 

 blood suggesting death by asphyxia. In tardy cases there may, 

 though rarely, b^ centres of broncho-pneumonia. The spleen is 

 enlarged, with dark color and uneven surface from rounded 

 swellings, and is filled by a .soft black, bloody pulp. The liver 

 is congested, the kidneys congested, enlarged and petechiated, 

 and the gastric and intestinal mucosa conge.sted and thickened, 

 with desquamating epithelium, and swollen .solitary and agminated 

 glands, the degree of alteration usually bearing a ratio to the 

 duration of the disease. The serosse are usually extensively 



