XI, B, 5 Boynton: Rinderpest in Swine 2hl 



imal did not react and was kept in the shed one hundred ninety- 

 one days with animals sick with rinderpest and did not develop 

 any ill effects from these exposures. 



In summing up the results of the exposures of the ten preced- 

 ing pigs, it will be noted that there is apparently a permanent 

 immunity conferred on them against rinderpest after recover- 

 ing from that disease, or at least for practically two years, which 

 is the average life of a hog used for food purposes. 



PIGS RECOVERING FROM RINDERPEST AND LATER BECOMING INFECTED 



WITH HOG CHOLERA 



The following experiment was designed to furnish information 

 as to whether pigs that had recovered from rinderpest were 

 susceptible to hog cholera. 



EXPERIMENT 42 



On May 15, 1916, pigs 293, 294, 295, and 296 were received 

 at the laboratory and placed in quarantine. 



May 17, these four animals developed symptoms which were 

 later identified as those of hog cholera. On this date the four 

 animals were transferred to shed No. 3 and placed in the same 

 pen with pigs 265, 272, 273, and 292, which had recovered from 

 rinderpest. 



Pig 265 recovered from rinderpest March 22, 1916. 



May 17, 1916, this animal was exposed to the four pigs sick 

 with hog cholera; this was fifty-six days after it had recovered 

 from rinderpest. 



May 30, pig 265 presented a rise in temperature. 



June 7-11, E. L. 



June 12, died of hog cholera, presenting good lesions of that 

 disease upon autopsy. 



Pig 272 recovered from rinderpest April 10, 1916. 



May 17, 1916, this animal was exposed to the four pigs sick 

 with hog cholera ; this was thirty-seven days after it had recov- 

 ered from rinderpest. 



May 30, pig 272 presented a rise in temperature. 



June 10-16, E. L. 



June 17-23, D., E. L. 



June 23, died of hog cholera, presenting good lesions of that 

 disease upon autopsy. 



Pig 273 recovered from rinderpest April 11, 1916. 



May 17, 1916, this animal was exposed to the four pigs sick 



