American Veterinary Review, 
MAT, 1880. 
ORIGINAL ARTICLES. 
UPON VIRULENT DISEASES, AND IN PARTICULAR 
UPON THE DISEASE VULGARLY CALLED 
CHICKEN CHOLERA, 
By M. Pasteur. 
Virulent diseases are counted amongst the greatest scourges. 
To be convinced of it, one has only to name measles, scarlet 
fever, small-pox, syphilis, glanders, yellow fever, typhus, cattle 
plague, etc., etc. This list, already so loaded, is far from being 
complete. All the great pathology is there. 
As long as the ideas of Liebig upon the nature of ferments 
prevailed, the various forms of virus were considered as sub¬ 
stances thrown into an intestinal motion, capable of communi¬ 
cating itself to the materials of the organism, and of transform¬ 
ing them into virus of the same nature. Liebig knew that the 
occurrence of these ferments, their increase and their power of 
decomposition, have a startling resemblance with the phenomena 
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