XI, B. 5 Boynton: Rinderpest in Swine 211 



Hutyra and Marek(4) state that the question of rinderpest 

 in swine is not definitely settled, undoubtedly basing their state- 

 ment on the contradictory results obtained by different workers. 

 They cite Carre and Fraimbault, Penning, and Theiler. 



Jobling,(5) in his annual report for 1903, cites an ex- 

 periment upon rinderpest in pigs in the Philippine Islands. 

 In this experiment he injected a farm-bred hog with 5 cubic 

 centimeters of virulent rinderpest blood from a bull. The hog 

 developed typical symptoms of rinderpest. Blood was taken 

 from it and injected into a hog and a bull. The hog that 

 received this blood did not develop any symptoms of the disease. 

 The bull that received the blood taken from the sick pig de- 

 veloped typical symptoms of rinderpest, but ran a mild course 

 of the disease and was bled to death. Upon autopsy this animal 

 presented lesions of rinderpest, but not so far advanced as is 

 usually noticed. 



In concluding this experiment Jobling says: 



This hog had the shortest incubation period of any animal I have seen, 

 and I would have believed it to be suffering from some other disease had 

 cow No. 46 not developed typical rinderpest after the regular incubation 

 period. 



From this one series of experiments it would appear that while the 

 hog may contract the disease and die, and its excreta may form a 

 source of infection for cattle and carabaos, yet it is difficult for the 

 sick hog to reinfect others of its kind. However, no definite conclusions 

 could be based upon the evidence at my disposal, and the work will be 

 continued when opportunity offers. 



Jobling also mentions the possibility of wild hogs spreading 

 the disease in the provinces. 



It may be mentioned here, as will be noted in the following 

 experiments, that hogs have as a rule a shorter incubation 

 period and show a higher temperature during the course of the 

 disease than do cattle and carabaos. The shortness of the in- 

 cubation period may be accounted for by the facts that hogs are 

 natural scavengers and when exposed to cattle and carabaos 

 sick with rinderpest devour large quantities of fseces from these 

 sick animals. In this way they immediately saturate their 

 systems with large quantities of the virus, which is always 

 present in abundance in the discharges of animals from the time 

 of the initial rise in temperature to the time of recovery or 

 death. 



When virulent rinderpest blood taken from pigs was used 

 in immunization work in the provinces, Doctor Youngberg 

 noted that the virus was activated and better reactions were 

 as a rule obtained than when the virulent blood was taken from 



