236 



The Philippine Journal of Science 



1916 



Pig 154 did not develop a rise in temperature or show any 

 symptoms of sickness from this injection. It was later exposed 

 in shed No. 3, where animals sick with rinderpest were kept, 

 and it continued to give the same negative results. 



In summing up the results of experiments 17, 18, 19, and 20, 

 it will be noted that the pigs used in experiments 17 and 18 

 had an incubation period of three days and ran a severe course 

 of the disease and died, presenting typical lesions of rinderpest 

 upon autopsy. 



Both of the pigs used in experiments 19 and 20 ran a high 



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Flc. 4. Temperature chart of pig 241 inoculated with blood from bull. 



temperature and developed diarrhoea previous to being used in 

 these experiments. At the time they were sick, it was thought 

 that they were suffering from hog cholera ; however, it is possible 

 that they were suffering from a mild form of rinderpest, as it 

 is almost impossible to distinguish the two diseases in pigs, unless 

 autopsy is made or their blood is inoculated into susceptible 

 cattle. These animals did not contract rinderpest when in- 

 oculated with virulent blood from cattle, and they did not con- 

 tract rinderpest by subsequent exposures. The blood with which 

 they were injected was proved to be virulent, as in both cases 

 it was used in immunizing work with good results. 



Hence pigs 239 and 154 were either naturally immune to 

 rinderpest or they had suffered from a previous attack of rin- 

 derpest and had acquired immunity. 



