HOW DOUBLE TREATMENT IS GIVEN 395 



have frequently seen done. Remember that this virus is exceed- 

 ingly dangerous, and, while it can do no harm to the hogs that have 

 been injected, yet if thrown on the ground of feed lots it causes 

 these feed lots to become infected, and any hogs which may later 

 on be brought into the lots would take the disease. There is 

 another danger, too, from the scattering on the ground of this hog- 

 cholera virus. It may be tracked on the shoes of some of the other 

 men who are present to help with the work, and be carried by them 

 to their feed lots, and prove to be the cause of starting an outbreak 

 of cholera in their herds. 



There are a number of cases reported where it is stated that the 

 use of the double method of treatment has resulted in the infection 

 of the feed lots, and caused an outbreak of the disease in unpro- 

 tected hogs which were brought into these lots in the following 

 year. This infection of the feed lots is blamed on the use of the 

 double treatment, when, in reahty, it is very frequently due to 

 carelessness in disposing of the virulent blood that is left over after 

 the treatment has been completed. 



Cleaning of Syringes. — There is only one proper manner of dis- 

 posing of this virus blood, and that is to destroy it by burning. In 

 this manner the cholera germs are entirely destroyed and there is 

 no danger of bad after-results. Also remember in cleaning the 

 syringe used for injection of the virus that it contains some of this 

 virus blood, and great care must be used to see that it is cleaned 

 with some solution that will destroy these germs. As a final clean- 

 ing process the syringe should be thoroughly boiled in water to 

 which some baking-soda has been added. 



Reaction Following Double Treatment. — Following the use of 

 the double treatment there may be slightly more of a reaction on the 

 part of the animal injected than in the case where the single treat- 

 ment is used. Following the single or serum-alone treatment about 

 all the after-effect that was noticeable was a slight stiffness and 

 soreness of the parts where the syringe was inserted. In the case 

 of the double treatment there may be somewhat more of a reaction. 



In using this double treatment we are injecting the hog with a 

 good-sized dose of the cholera virus, and, even though protected 

 by an accompanying dose of serum, it is not unusual to meet with 

 a case where for a few days the animal will show some signs of being 



