128 DISEASES OF SWINE 



yards set off for this purpose, and that do not in 

 any way communicate with the regular yards. 

 They should also be dipped or washed with a tar 

 disinfectant. This latter precaution is necessary 

 because of the possibility of the hogs carrying the 

 ■ germs on their bodies in the dirt and dust coming 

 from infected places. The quarantine period 

 should be somewhat longer than the average pe- 

 riod of incubation. Three weeks is as long a time 

 as necessary. 



The possible introduction of the disease into the 

 pens by people, dogs, birds, etc., should be guarded 

 against, especially if the disease is present in the 

 neighborhood. The distribution of the germs of 

 hog cholera by these agents is not as common or 

 as greatly to be feared, as a few years ago, when 

 the nature of the contagion was not well under- 

 stood, and people were allowed to enter the yards 

 and carry away enough of the infectious material 

 on their shoes to infect other places. Whenever 

 it is necessary to enter a hog lot where the disease 

 is known to exist, the shoes should be cleaned and 

 disinfected on leaving it. Persons taking care of 

 the sick animals should practice all precautions 

 possible against the distribution of the disease, and 

 see that others observe like precautions. The 

 burial of the dead animals has grea)tly diminished 

 the danger of spreading the disease by dogs and 

 buzzards, but crows, pigeons and sparrows are 

 still to be considered carriers of the infectious 

 material. 



