PATHOGENIC BACTERIA. 



gluing the lids together. The breathing is rapid, and 

 there may be cough. Occasionally there is an eruption 

 with crusts or scabs of various sizes on the skin, which 

 is often congested. The animal becomes weak, stands 

 with arched back and drawn abdomen, and walks with a 

 weak, tottering gait. 



The course of this disease varies from one or two days 

 to two or three weeks. 



At post-mortem examination petechiae, ecchymoses, and 

 extravasations of blood into the tissues are found to be com- 

 mon and form one of the principal changes in the acute 



FIG. 113. Bacillus of hog-cholera, showing flagella. 



form of the disease. The spleen is enlarged to two or four 

 times its normal size, and is soft and engorged with blood. 

 The extravasations of blood are common in the lym- 

 phatic glands, beneath the serous membranes of the 

 thorax and abdomen, and particularly along the intes- 

 tines; on the surface of the lungs and kidneys and in 

 their substance. The contents of the intestine are some- 

 times covered with clotted blood. In the subacute form 

 of the disease the principal changes are found in the 

 large intestine, and consist of ulcers which appear as 

 circular, slightly projecting masses varying in color from 



