Swine Growers' Session. 



109 



never showed any signs of illness from the simultaneous injection 

 of virulent hog cholera blood. One of these pigs received 2 c. c. 

 of the preserved blood ; another, 1 c. c. of preserved blood, while 

 the third received 1 c. c. of the fresh virus. 



The two "check" pigs, and the pregnant sow, which had been 

 left in the pen, and had not been injected with either serum or in- 

 fectious blood, all contracted the disease in the natural way by 

 simple exposure to the sick vaccinated pigs. The first signs of ill- 

 ness in these "check" pigs occurred on November 16th, twelve days 

 after the first symptoms of sickness were observed in the vaccinated 

 pigs. Three days later (November 19th) the remaining non-vac- 

 cinated hog was "off feed." November 21 the pregnant sow abort- 

 ed. On November 23, after an illness of several days, one of these 

 sick pigs died, having shown during this time the usual symptoms 

 of cholera; as, loss of appetite for food, great thirst, emaciation, 

 great weakness, unsteady gait, shivering as if cold, tendency to 

 burrow under the bedding. The autopsy showed: congestion of 



Lot 4. Pigs 1 to 6 vaccinated from "viscera fed" immune— pig No. 6 died. Nos. 1, 2 and 3 



remained healthy, 3 and 4 sick, but recovered. Pigs A, B and O not 



vaccinated. All these "check" pigs died. 



the lymph glands, small blood spots (petechiae) on the serous coat 

 of the small intestines and on the kidneys — a number of small 

 ulcers on the mucous surface of the blind gut (caecum) ; mucous 

 surface of the intestines greatly congested; small blood spots 

 (petechiae) on the pericardium; the lungs were in fair condition. 

 November 26 check pig No. 2 was desperately sick, and was 



♦To the time of issuing this report these pigs have remained in the same pen over 150 

 days and have shown no evidence of sickness. 



