no FOWL CHOLERA 



BLOOD COUNTS OF APPARENTI^Y HEALTHY FOW%S. 



Fowl. White Corpuscles. Red Corpuscles. 



No. II 24,000 2,980,000 per cmii 



No. I2-. 26,300 2,987,000 



No. 14- 36,000 3,115,000 



No. 15. 52,000 3,980,000 



No. 16 61,000 3,920,000 



No. 17 30,000 2,380,000 



No. 18 24,000 2,620,000 



The duration of the disease varies from a few hours to 

 several days. 



The prognosis is unfavorable. The mortality is very high, 

 often 100 per cent. 



§ 91. Differential diagnosis. Fowl cholera is to be 

 differentiated from : 



1. A number of dietary disorders which cause the death 

 of a large number of fowls. Such cases are often thought to 

 be chicken cholera and so reported by the owners. A diagno- 

 sis is to be made from the bacteriological findings. 



2. It is to be differentiated from fowl typhoid. There 

 There are a number of resemblances in the clinical history of 

 the two diseases but there are marked differences in both the 

 morbid anatomy and etiology. For a comparison of the lesions 

 and specific bacteria of these two diseases see fowl typhoid. 



§ 92. Prevention, Pasteur introduced a preventive 

 inoculation or vaccine for this disease. Kitt has found that 

 the eggs of fowls unknown to this disease possessed a sub- 

 stance somewhat similar to antitoxin. He immunized fowls 

 by injecting them simultaneously with from four to eight 

 cubic centimeters of the whites of such eggs. While exceed- 

 ingly interesting this method does not seem practicable. More 

 recently he has obtained a horse serum that promises to be of 

 immunizing value. Good sanitary conditions, isolation of the 

 well from the sick fowls and thorough disinfection seems to 

 be the most satisfactory procedure. It is important not to 

 introduce the disease with newly purchased fowls or to expose 

 healthy ones to the disease either at or in transportation to 

 various poultry exhibits. 



