HOG CHOLERA 



211 



How scattered. — The virus of this disease may be carried from 

 place to place in any way that very fine particles of heavy dust 

 may be carried, e.g., by people, upon shoes, or by Avagons or stoe-k 

 cars. Dogs are frequent carriers of the tlisease. Running 

 streams and shallow lakes are serious factors in its spread. 

 Bowel discharges are very important sources of infection^ and, 

 if yards or pens drain into streams or lakes, water tlien becomes 

 the carrier of infection. Hogs that have died of cholera are 



Fig. 74.— Hog Cholera. (M. H. E.) 



Large intestine; mucous membrane showing general distribution of 

 typical ulcers. /, Ileum; C, caecum or blind pouch. 



sometimes thrown into streams or buried in sand near the edge 

 of a stream or lake, thus infecting the water. 



Hog cholera virus may live many months; around strawstacks 

 and old sheds under favorable conditions. 



When an outbreak appears.— In cas<> ihere is a suspicious 

 disease among hogs, the matter should be reported promptly to 

 health officers so that this first outbreak may be i)roniptl,y and 

 rigidly (luarantined and the hogs vaccinated. If reliable serum 

 for vaccination is not available then but one person should have 

 the care of a herd of healthy hogs, and should not be allowed to 

 go where there is possibility of carrying the infection on shoes, 



