12 



HOG CHOLEEA 



Degrees 



Material Centigrade 

 Liquid serum 

 filtrate 46 



Liquid serum 

 filtrate 55 



Liquid serum 

 filtrate 60 



Liquid serum 

 filtrate 58 



Liquid serum 

 filtrate 

 Dried blood 

 Dried blood 

 Dried blood 



Urine 

 Urine 



78 

 65 



72 

 72 

 58 

 58 



Low temperatures act to prevent growth of 

 putrefactive organisms and are thus instrumental 

 in prolonging the life of the virus. In our own 

 experiments, hams removed from cholera infected 

 pigs and frozen hard ninety-three days still har- 

 bored virus sufficient to produce the disease when 

 small portions of them were fed to susceptible 

 pigs. 



Disinfectants. Hog cholera virus readily re- 

 sists ordinary disinfectants in dilutions that are 

 rapidly fatal to most bacteria. When y 2 per cent 

 phenol is added to virulent blood, the virus will 

 remain alive for months, and all of the coal tar 

 disinfectants must be prepared in strong solutions 

 in order to destroy it. Liquor cresolis compositus 



