Fowl Cholera, Fowl Typhoid and Fowl Plague 103 



What appears to be the genuine European fowl cholera has 

 been reported several times within the last few years. 



Etiology. — Fowl cholera is caused by a minute bacterium 



Fig. 10. — Stained preparation of the heart blood of a pigeon infected with 

 fowl cholera. The small objects between the blood corpuscles, each 

 showing two dots of color, are the cholera bacteria. (After Kolle and 

 Hetsch.) 



known as Bacillus avisejiticus {B. bipolaris septicus). This 

 is a small oval organism which when stained and placed under 

 the microscope shows a dot of color at each end while the 

 middle part remains entirely unstained (Fig. 10). 



