SYMPTOMS IN ACUTE TYPE 171 



ing the course of the disease, and yet which showed but very Uttle 

 disease in the lungs when opened up after they had died. In 

 these cases, however, there was no doubt a sufficient amount of 

 the virus in the blood circulating through the lungs to cause severe 

 irritation, and bronchitis enough to produce a bad cough without 

 showing any marked change in the lungs on examination after 

 death. 



As the course of the disease progresses there is the appearance, 

 about the second or third day, of a very important and decidedly 

 common symptom, one which is of great help in making a diagnosis 

 of the disease. This is the appearance on the skin of a number of 

 bright red blotches or spots. These first make their appearance 

 on the ears, the eyelids, the snout, the breast, the inner side of the 

 flanks, in the fold between the front legs and the chest-wall, and 

 along the belly. 



These spots first appear simply as a red flush of the skin, and 

 disappear if they are pressed upon by the finger, but return again 

 in a few seconds after the finger is removed. As the condition 

 gets worse the ears begin to swell, and a little later there is swelling 

 of the eyelids and other parts of the skin. There is now noted the 

 appearance of another kind of reddish spots in the skin. The 

 spots which now appear are of a darker red color, being often a 

 deep purple or bluish shade rather than a bright red, as were the 

 first spots noted. These new spots are also more permanent and 

 will not disappear on pressure with the fingers as did the ones first 

 described. Some of them are very small, being about the size of 

 a pin-point, while others are quite large, and some of them may be 

 even as large as the palm of the hand. 



In some of the very severe cases the skin is spotted over with 

 these red spots from one end of the body to the other, and it is not 

 unusual to find an animal in which the entire skin appears bright 

 red in color. This is due to the fact that the hog-cholera virus after 

 it enters the body is carried into the blood-vessels, and it causes 

 these vessels to get swollen and filled with bright red blood. This 

 is what causes the redness. When we press on these swollen blood- 

 vessels with the finger we force the blood out of them, and that is 

 why the redness disappears on pressure. In more severe cases 

 the virus collects in the small blood-vessels and plugs them up, or 



