Microhic Diseases Individually Considered. 203 



the veins, however, must be made with the greatest 

 care in order to avoid the accidental deposition of any 

 of the virus in the surrounding tissue, hence, in prac- 

 tice, the attenuated viruses are generally preferred to 

 the natural viruses, for the production of immunity. 



Bouget of the pig.* 



This disease, peculiar to the pig, is infectious and 

 contagious ; it chiefly attacks adult animals and those 

 of the improved breeds. It manifests itself by a very 

 intense febrile reaction, by red or purple patches, at 

 first discreet and afterward confluent, upon the integu- 

 ment, by a diarrhoea more or less intense, succeeding 

 to constipation, and often by cough. The redness of 

 the skin may be absent in very acute cases. 



The duration of the disease is always short, on an 

 average, two days ; it may, however, last four or five 

 days, and, on the other hand, may occasionally be al- 

 most fulminating in character. 



Death is the usual termination, but a considerable 

 proportion of pigs may recover. Moreover, all the 

 the pigs which have been in contact with diseased 

 animals do not necessarily contract the disease. 



The autopsy discloses a general congested condition 

 of the capillaries. There is injection and serous infil- 

 tration of the skin and subcutaneous cellular tissue, 

 injection with petechise and sero-fibrinous exudation 

 of the peritoneum, pleura and pericardium, changes 

 of the same kind in the gastro-intestinal canal in 

 which the mucosa is reddened, thickened and infil- 



* [Eng. Swine erysipelas: Ger. Rothlanf. The disease has not 

 been recorded in the United States or Canada. — D.] 



