184 HOG CHOI.ERA 



5. The virus ma}- be carried b}- buzzards, crows and 

 other birds. There is no positive proof that the virus has been 

 disseminated in this way although there is much evidence to 

 support such a theory, particularly in the South. Several out- 

 breaks have been attributed to this method of introducing the 

 virus. The hypothesis emphasizes the necessity for prompth^ 

 disposing of the dead animals instead of leaving them as prey 

 for scavengers. If the}' cannot be burned it is best to cover 

 the bodies with a liberal amount of lime and bury them. 



§ 140. Specific treatment. A large number of inves- 

 tigations have been made to find a protective vaccine method 

 for this disease and also to find a specific serum treatment. 

 Thus far satisfactory experimental results have not been 

 obtained. In a number of instances where the practical 

 applications of the "serum treatment" has been made, most 

 satisfactory results followed, but the reports fail to give evi- 

 dence of an accurate diagnosis of the disease treated. In 

 these cases, the better management of the animals, in addition 

 to the serum, would suffice to check the disease if the trouble 

 was of a dietary nature. There is need for additional inves- 

 tigation along these lines. 



REFERENCES. 



1. Billings. Bidletins Neb. Agric. Expt. Staiiott 1888. Also many 

 special publications ajid contributions to various veterinary journals. 



2. Dawson The serum diagnosis of hog cholera. New York 3/cd. 

 four. Feb. 20. iSgj. 



3. DE SCHWEiNiTz. The production of inmuinitj' in guinea pigs 

 from hcg cholera by :he use of blood serum from iir.ii;uniz"d animals. 

 Annual Report of the Bureau of Animal Industry, U. S. Dept. of Agri- 

 culture. i8gS. 



4. Peters. Serum therapy in hcg cholera. Bulletin No. 4J. 

 Univ. of Neb. Agri. Exper. Station. iSgy. 



5. Salmon and Smith. Annual Reports of the Bureau of Ani- 

 mal Industry. iSS^-i8g^. 



6. Salmon. vSpecial Report on hog cholera, its History, Nature 

 and Treatment. U. S. Bureau of Animal Industry. 1SS9. 



7. Smith. Zur Kenntniss des Hog cholera Bacillus. Antralhlatt 

 fur Bakler. u. Parasitenkunde. Bd. IX. (1S91) S. 253. 



8. Smith. Hog cholera group of bacteria. Bulletin No. 6 U. S. 

 Bureau of Animal Industry. 1894. p. 9. 



9. Smith and Moore. Experiments on the production of immu- 

 nity in rabbits and guinea pigs v.ilh reference lo hog cholera and swine 

 plague bacteria. Ibid. p. 41. 



