340 DISEASES OF SWINE 



the blood. For this purpose the pig is covered over usually with 

 a clean white sheet that has been previously dipped in a solution 

 of one of the powerful disinfectants, the object of this being to 

 prevent any dirt from the skin of the animal falling into the 

 bottle or other container along with the blood. 



Toward the end of the bleeding it is of advantage to loosen the 

 front legs of the animal and perform artificial respiratory move- 



Fig. 61. — Bleeding for virus. Showing use of tube for drawing blood. (Photo 

 by Dr. Geo. R. White.) 



ments, as this aids in emptying the larger blood-vessels and in- 

 creases the amount of virus blood obtained. 



As a further precaution against any contamination of this virus 

 blood with germs of other kind than those of cholera, the operator 

 who is to do the bleeding should thoroughly wash his hands in 

 soap and water and effective disinfectant solutions before com- 

 mencing the work. In fact, he should make just the same prepara- 

 tion that he would make if he were about to perform an operation 

 upon the organs of the abdominal cavity. The knife and other 



