430 HOG CHOLERA 
showing very slight if any clinical evidence of disease. Usually a moderate elevation 
of temperature is the only symptom noted. (Birch.) 
Control. Hog cholera can be checked in a herd by making an 
early diagnosis and promptly using serum on all of the animals not 
showing symptoms. The broader question of control, however, re- 
quires the enforcement of all sanitary procedures necessary to pre- 
vent the spread of the virus. During recent years there has been 
much progress in checking the losses from this disease but its spread 
has continued largely because the dissemination of the virus has not 
been controlled. At present there are in this country important in- 
vestigations and experiments under way, which, when completed, 
will presumably give valuable information concerning the details to 
be observed for its control. 
REFERENCES 
1. Berry. Swine-fever. Jour. Compar. Path. and Therap., Vol. XV (1902), p. 1. 
2. Bruwes. Bulletins Neb. Agric. Expt. Station, 1886-1893. 
3. Brircu. A study of hog cholera transmission. Report of the N. Y. State Vet. 
College, 1913-14, p. 106. 
4. Bupp. Typhus in pigs. The Veterinarian, 1865, p. 521. 
5. Dawson. The serum diagnosis of hog cholera. New York Med. Jour., Feb. 20, 
1897. ; 
6. Dr Scuwernitz. The production of immunity in guinea pigs from hog cholera 
by the use of blood serum from immunized animals. U.S. Dept. of Ag. B.A. I. Ann. 
Rept., 1898, p. 269. 
7. Ds Scuwernitz anp Dorset. A form of hog cholera not caused by the hog 
cholera bacillus. Circular No. 41, U. S. B. A. I., 1908. 
8. Detmers. Report of the U. S. Department of Agriculture, 1877. 
9. Dorset. Hog cholera control investigations of the United States Department 
of Agriculture. Report of progress. Proc. of U. S. Live Stock San. Asso., 1915, p. 99. 
10. Dorset. The control of hog cholera. A review of four months’ work by the 
Bureau of Animal Industry. Proc. of U. 8. Live Stock San. Asso., 1913, p. 38. 
11. Dorset, Botron anp McBrype. The etiology of hog cholera. Bulletin No. 
72, B.A. I. U.S. Dept. of Agric., 1905. 
_ 12. Dorssr, McBrype anp Nixes. Further experiments concerning the produc- 
tion of immunity from hog cholera. Bulletin No. 102, Bureau of Animal Industry, 
1908. 
13. Ercuuorn. Preparation of hog cholera serum in Hungary. Proc. of U. 8. 
Live Stock San. Asso., 1910, p. 33. : 
14. Fiscuzr. The control of hog cholera with immune serum. Proc. of U. S. 
Live Stock San. Asso., 1912, p. 79. 
ae Fiemme. Animal plagues, their history, nature and prevention. London, 
16. Guasrr. Studie uber die Aetiologie der Deutschen Schweinepest. Deutsche 
Tierdrz. Wochens., Bd. XV (1907), S. 617. 
17. Hinton. The control of hog cholera by slaughter methods. Proc. of U. S. 
Live Stock San. Asso., 1913, p. 138. 
18. Kine, Bazstack anp Horrmann. Studies on the virus of hog cholera. Jour. 
Infect. Dis., Vol. XII (1913), p. 206. 
