ANIMAL PARASITES 318 
ANIMAL PARASITES 
There are some diseases of animals caused by microscopic 
animal parasites. Of these the only well-known example in this 
country is Texas fever or, as it is frequently called, the tick fever. 
This latter name is given to it from the fact that the disease is dis- 
tributed by means of the cattle tick. Other diseases caused by 
animal parasites are surra and the tsetse fly disease or nagana, 
neither of which is found in this country. 
Diseases of Other Animals.—Parasitic diseases are found in 
all animals bred upon the farm, each animal having its own 
peculiar types. Ordinary fowls have fowl cholera, roup, diarrheal 
diseases, etc., and turkeys, geese, and ducks have diseases of their 
own. Even fishes are subject to diseases produced by bacteria 
of other fungi. It is impossible in this work to consider this 
subject further, but it is well to bear in mind that the list of 
parasitic diseases is a long one and is being increased constantly 
as investigation is being extended. 
