PEEPAEATION OF ANTI-HOG-CHOLERA SEBUM 85 



Four or five days subsequent to injection the 

 pig should show a temperature near 106 F., and 

 a day or two later marked symptoms of hog chol- 

 era should appear. As a very general guide it 

 may be said that a virus pig is ready to bleed when 

 it has carried a high temperature for about three 

 days and when it has shown severe symptoms of 

 hog cholera for about two days. A good strain of 

 virus will bring this about in approximately seven 

 days subsequent to the date of injection. The 

 time required may be extended in certain individ- 

 uals, but a virus that regularly requires more than 

 eight days in which to ' ' ripen ' J pigs for bleeding 

 is not desirable for hypering. 



Bleeding the virus pig. When the sick pig is 

 ready to bleed for virus it is taken to the labora- 

 tory. In the preparation room the entire body 

 is washed, and the animal is secured to a tilting 

 operating table, revolving door or other device for 

 securing it by the hind legs and suspending it 

 head downward. The front legs are secured well 

 apart and the snout tied backward, stretching the 

 skin covering the throat. The throat and sternal 

 region are then thoroughly lathered (an antiseptic 

 soap is desirable), carefully shaved and rinsed, 

 and an antiseptic solution is applied. If it is a 

 male pig a clamp is attached to the prepuce to 

 prevent dribbling of urine. Finally the entire 

 body is covered with a cloth, previously dampened 



