American Veterinary Review, 
JULY, 1880. 
ORIGINAL ARTICLES. 
CHICKEN CHOLERA, 
STUDY ON THE CONDITIONS OF THE NON-RECIDIVITY OF THE 
DISEASE AND OF SOME OTHER OF ITS CHARACTERS. 
By M. L. Pasteur.* 
In a former communication, I announced, among other con¬ 
clusions, that chicken cholera was produced by a microscopical 
parasite; that there existed an attenuated virus of this disease; 
and lastly, that one or several inoculations with that virus would 
insure protection from the fatal effects of a subsequent inocula¬ 
tion.! From the strong similarities that our study discovers be¬ 
tween the effects of vaccine and human variola, it becomes an 
* Translated by A. Liautard. 
f Messrs. Moritz and Perroncito, as well as Mr. Toussaint, who went further 
than they, had left the question of the parallelism of that affection doubtful. In 
my preceding note, I expressed myself in a different manner; but I have since 
learned that Mr. Toussaint had failed in his endeavors to obtain successive cul¬ 
tures in neutralized urine, a merit which, however, he does not claim, though he 
still enjoys the credit of the endeavor. 
