Diseases of the Circulatory System 191 



shows enlargement of liver and spleen. The crisis of the 

 disease occurs on the fourth or fifth day. In fatal cases the 

 fever disappears and the temperature sinks to below normal 

 shortly before death. 



FAiology. — This disease is caused by a spirochsete {Spiro- 

 choeta gallinarum) found in the blood and in the liver and 

 spleen. According to Balfour ^ the parasitic organisms 



Fig. 34. — Bird suffering from spirochsetosis. (From Kolle and Hetsch.) 



enter the blood corpuscles. Both the organisms and the 

 corpuscles then degenerate. According to Lounoy and 

 Bruhl ^ the number of erythrocytes may be reduced one- 

 half in five days. A favorable turn at the crisis of the dis- 

 ease is due, according to Levaditi and Manouclian,^ to the 



^Balfour, A. S., "Spirochsetosis of Sudanese Fowls — an After 

 Phase." Jour. Trop. Med. and Hyg., Vol. 11, p. 37, 1908. 



2 Lounov, L., and Bruhl, M. L., Ann. Inst. Pasteur, T. 28, pp. 

 517-539, 1914. 



^ Levaditi and Manouclian, Ann. Inst. Pasteur. T. 20, pp. 

 593-600, 1906. 



