540 SWINE IN AMERICA 



infected — not sooner than three months after the last 

 hog has been removed. Before restocking, the premises 

 should be cleaned and thoroughly disinfected. 



SYMPTOMS OF CHOLERA 



"The beginning of cholera in a herd is marked by the 

 sickness of one or two hogs, and the disease may not 

 be suspected until a week or two later, when other hogs 

 are attacked. As the number of sick hogs increases the 

 opportunities for the well animals to contract the disease 

 are multiplied, and in a comparatively short time all 

 hogs exposed will be attacked. 



"The symptoms observed in particular cases will be 

 influenced by the virulence of the germ responsible for 

 tlie attack, and also by the resisting power of the hogs. 

 If this resisting power is low, or if the germ is of high 

 virulence, we may have a typical manifestation of the 

 acute type of cholera. In this the chief symptoms are 

 sluggishness, disinclination to move, weakness, loss of 

 appetite, a high fever, inflammation of the eyes with 

 gumming of the lids, and maybe diarrhea. If the 

 animals are examined carefully, red or purplish blotches 

 may be seen on the skin, especially over the surface of 

 tlie abdomen, on the inside of the legs, and around the 

 ears and neck. As a rule the progress of the infection 

 is so rapid that the hog is not greatly emaciated before 

 death; it is, in fact, usual in acute outbreaks for hogs 

 to die after being sick only a few days. 



"In the chronic type of the disease the symptoms are 

 finite similar to those seen in acute cases. The sick 



