390 The Diseases of Animals 
weeks before allowing other susceptible dogs to oe- 
cupy them. 
HOG CHOLERA AND SWINE PLAGUE 
Hog cholera and swine plague are different dis- 
eases, and yet they are so closely associated that 
one disease rarely appears without the other. Swine 
plague is an infectious pneumonia, that attacks swine 
when in poor, unthrifty condition, or when run down 
from an attack of hog cholera. It is probable that 
germs of swine plague are widely distributed wherever 
hogs are kept in large numbers, but the natural power 
of resistance of the animal’s system is sufficient to 
prevent them from developing after entering the sys- 
tem. When, however, the system becomes weakened 
from disease or other injurions influences, the germs 
obtain a foothold and often cause serious damage, not 
only from the deaths that directly result from the 
pneumonia but from the hog cholera, with which the 
swine plague is usually associated. 
Hog cholera is an infectious disease of the intestinal 
tract, that resembles typhoid fever in man. The hog 
cholera is aggravated by the pneumonia, and between the 
two diseases the vital powers of the animal are greatly 
lessened. In man, typhoid fever and pneumonia are 
often associated. The losses from hog cholera and swine 
plague are diffienlt to estimate accurately. Persons famil- 
iar with the snbject estimate that the losses caused by 
these diseases are greater than those caused by any other 
Gisease of domestic animals. Others go further, and 
