MICROBIAL DISEASES OF MAN AND ANIMALS. 663 



cauterization should not be omitted even if twenty-four hours have 

 elapsed. Cauterization cannot be relied upon to prevent the development 

 of rabies, but it does serve to prolong the incubation period. The Pasteur 

 treatment should then be instituted as soon as possible, and it has proved 

 to be practically an absolute preventive, provided the incubation period 

 of the disease is sufficiently prolonged for the treatment to become effect- 

 ive, and this is usually the case. The treatment consists in the daily 

 subcutaneous injections of altered fixed virus for a period of about three 



FIG. 116. Two nerve cells of hippocampus major (smear preparation) showing 

 Negri bodies. A, Negri bodies; B, inner bodies within the Negri bodies. (After 

 Reichel, American Veterinary Review.} 



weeks, and is most effectively given at Pasteur Institutes devoted especi- 

 ally for this work. Valuable animals as well as man may be successfully 

 treated in this way. 



The general prevention of rabies depends almost solely upon the 

 efficient control of all dogs in a community. General muzzling, strictly 

 enforced, is a certain preventive of rabies, and in countries where this is 

 done rabies is practically unknown. 



SWAMP FEVER.* 



This is a comparatively new disease of horses so far as definite infor- 

 mation is concerned, but is in reality an old disease that has been described 



* Prepared by M. H. Reynolds. 



