GLANDERS. 
9 
render the disease unusually mild, permitting many of the 
animals to recover in southern Russia, Roumania and Italy. 
These influences are very marked also in America. In 
Mexico, glanders occurs rarely, is not inclined to spread and 
runs a very mild course. 
In the United States we find marked variations in different 
localities. 
In the Atlantic, Gulf and Mississippi Valley States the 
disease prevails to a considerable extent and in rather severe 
form. 
Even in those states however, three-fourths or more of the 
horses have the disease in the mild or chronic form, so that they 
will live for several months or even years, while some of the 
affected horses will remain fat and vigorous, and perform ordin¬ 
ary work without difficulty for several years, and occassionally 
they apparently recover, although as a rule still capable of trans¬ 
mitting the desease. A smaller number of the diseased animals 
in these states are affected in the severe form, the affection run- 
ning a rapid course, ending in death in from 15 to 60 days. 
As we approach the high plains sloping eastward from the 
Rocky Mountains the disease, although quite common, is very 
mild and the acute or severe type is seldom witnessed, most af¬ 
fected animals living for months and even years in good 
condition. 
In the higher altitudes of the Rocky Mountains and along 
their western slope the disease assumes a still more mild type, 
being very rarely seen in the severe form, but usually of a very 
mild character which under favorable surroundings does not ma¬ 
terially affect the vigor of the animal even though at a reasonable 
labor, so that the lives of most affected horses are not shortened 
greatly if at all by the disease but generally live for an indefinite 
number of years, while many diseased animals show no external 
symptoms whatever, and many horses at one time plainly affect¬ 
ed with glanders make apparent recoveries and remain to all 
appearances sound for years. 
When however, the weather is inclement, stormy and wet 
