Fold Cholera, Foicl 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 KoUe and 

 Hetsch.) 



known as Bacillus avisepticus (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). 



