168 HOG CHOLERA 



cause each time an infected animal urinates, rein- 

 fection of its pen takes place. As long as hog 

 cholera is active in a herd we should devote our 

 attention to effective quarantine, prompt disposal 

 of carcasses, and the maintenance of ordinary 

 cleanliness that is at all times conducive to the 

 health of the animals. When the disease disap- 

 pears, all contaminated litter should be burned, 

 and the indoor quarters sprayed with 3 per cent 

 lysol or compound cresol solution. Often appli- 

 cation of disinfectant at intervals of several days 

 is advantageous. Hog cholera virus cannot al- 

 ways be killed in outside yards. Spreading a 

 thick layer of straw over the yard and burning it 

 is probably most effective, but this is not always 

 practicable. Plowing and free use of disinfec- 

 tants hasten destruction of the virus, but the lat- 

 ter measure is useful only in small enclosures. 



Too often directions given for disinfecting quar- 

 ters require more than is possible, and they are not 

 specific. If we are careful not to require unneces- 

 sary and laborious measures we will secure much 

 better cooperation in carrying out those that actu- 

 ally are essential; and if surroundings are such 

 that we find it impossible to give detailed and spe- 

 cific directions for cleaning and disinfecting, we 

 may be sure that the general admonition to " clean 

 and disinfect " will do very little good. We must 

 recognize the fact that some hog quarters cannot 



