ROUGET, ROTHLAUF. RED FEVER OF SWINE. 

 SWINE ERYSIPELAS. 



Definition. Comparative immunity of sucking pigs. Disease unknown 

 in America. Causes : Bacillus erysipelatos suis, mature age, infection 

 through yards, buildings, troughs, dust, mice, rabbits, pigeons, men, dogs, 

 vermin, birds, butcher's and kitchen scraps, swill, hot weather, damp sea- 

 sons, close pens, movement of swine, stockyards, fairs, public conveyances, 

 public highways. Symptoms : incubation three days, chill, violet mucosae, 

 hyperthermia, recumbency under litter, muscular weakness especially behind, 

 inappetence, thirst, costiveness, later diarrhoea, tenderness to touch, lymph 

 glands swollen, red, blue, violet or black discoloration of skin, cutaneous 

 swelling and pitting. Course : death in 12 hours to 6 days, or convales- 

 cence prompt. Mortality 20 to 80 per cent. Lesions : congestion of capil- 

 lary vessel, blood extravasations, petechiae, affecting cutis and subcutaneous 

 fat, lymph glands congested, discolored ; lungs engorged ; spleen enlarged, 

 liver and kidneys congested, petechiae general, blood little altered. Bacillus 

 1.5 fj., anaerobic, easily destroyed in pens, in pork. Pathogenesis : swine, 

 rabbits, mice, rats, pigeons and sparrows suffer. Rabbit germ less fatal to 

 pigs. Immunization, advantages and drawbacks. Technique. 



Definition. A mierobian disease of swine manifested by high 

 fever, great prostration and muscular weakness, a violet tint of 

 the visible mucosae, red or violet discoloration of the skin in spots 

 and patches or universally, enlarged lymph glands, encreased size 

 of the spleen, and general congestion of the capillary plexus. 



Contrary to the habit of hog cholera and swine plague, rouget 

 attacks mature swine mainly, the sucking pig showing a remark- 

 able power of resistance. It does not appear whether this is due 

 to the animal (milk) diet or to the absence of infection from feed- 

 ing in the trough used by the adult animals. Up to the present 

 this disease has not been recognized in America. 



Causes. The one essential cause of rouget is the presence of the 

 bacillus. The other conditions are either such as predispose the 

 animal to receive it, for example, mature age : or they are such 

 as favor diffusion of the poison, such as the introduction of an in- 

 fected animal, the feeding of the healthy from the same manger 

 with the infected, the introduction into the manger of the feet or 

 snout which have become soiled with the infected manure or 

 urine, the distribution of the infection in dust, the introduction of 

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