74 
North Carolina Experiment Station 
In America, special stress seems to be laid on fowl cholera in the West 
and Middle West, where exhaustive studies, especially on the serological 
side of the question, have been conducted by several experiment stations. 
In the northeastern section, both the diseases are reported to a considerable 
extent, while in the South, the avian typhoid seems to be more prevalent 
than cholera. In North Carolina, 55 outbreaks have been diagnosed as fowl 
typhoid in the last two years, with no outbreaks attributed to the fowl 
cholera pasteurella. 
The Causative Organism.—The causative organism of avian cholera is 
designated as the Pasteurella avicida according to the Classification of The 
Society of American Bacteriologists, 1917-20. 
FIG 
31 
P. avicida on glygerine-agar slant 
