ii6 



Journal of Agricultural Research voI.xiii.no. 2 



the exposed pigs were again transferred to separate, clean, disinfected 

 pens. This was repeated at 48-hour intervals up to and including the 

 tenth day. 



The records of the three pigs which furnished the exposure are given 

 in Table VII. 



Table VII. — Records of the three pigs which served as the source of hog-cholera infection 



Nov. 10 

 Nov. II" 



Pig iioi. 



Tem- 

 pera- 

 ture. 



103.8 



103- 3 

 104.7 



104.4 

 103.6 

 106. o 

 104. 8 

 103.8 



104.4 



Symptoms. 



Normal . In- 

 jected this 

 day. 



Normal 



....do 



....do 



....do 



Off feed 



....do 



....do 



....do 



Off feed; diar- 

 rhea. 

 do 



Pig 1102. 



Pig 1103. 



Tem- 

 pera- 

 ture. 



°F. 



104. O 

 103.6 



104. 2 



104. 2 



104. 2 



105. 2 



104. O 



105. 4 

 104. 4 



Symptoms. 



Normal . In- 

 jected this 

 day. 



Normal 



....do 



....do 



....do 



Off feed 



....do 



...do 



do 



do 



.do. 



Tem- 

 pera- 

 ture. 



'F. 



103-7 

 103. 6 

 104.4 



104.4 

 103. 6 

 ig6. o 



I04- 5 

 105.4 



105.4 



Symptoms. 



Normal. Injected 

 this day. 



Normal. 



Do. 



Do. 



Do. 

 Off feed. 



Do. 



Do. 



Do. 



Do. 



Off feed; con- 

 jun ctivitis, 

 weakness, and 

 diarrhea. 



a The pigs were transferred to clean, disinfected pens on these dates and 2 susceptible pigs placed 

 with them for 48 hours. 



The subsequent history of the pigs which furnished the exposure was 

 as follows: Pig iioi died on November 14 and exhibited extensive 

 hemorrhagic lesions of hog cholera. Pig 1102 developed conjunctivitis 

 and had a fever temperature up to November 17; this pig recovered and 

 was first reported as normal on November 24. Pig 1 103 died on Novem- 

 ber 15, and showed hemorrhagic lesions with ulceration of cecum and 

 colon. 



The results of the experiment are shown in Table VIII. 



Only 2 of the 12 exposed pigs escaped infection, and those were the 

 two which were exposed to the infected pigs during the first 48 hours 

 after injection. All of the other exposed pigs developed acute hog 

 cholera and either died or were killed when in a moribund condition. 

 The injected pigs which furnished the exposure did not show visible 

 symptoms of disease until the fifth day. 



