JOHNE’S DISEASE 197 
definite knowledge of the resistance of the specific bacteria outside 
the animal body, or the length of time that a contaminated pasture 
may be dangerous. 
In the present state of knowledge, the formulation of a method for 
prevention is an extremely difficult task on farms where the disease 
has existed for a number of years. The isolation or destruction of 
diseased and suspected animals should be practiced. The feces 
passed by diseased or suspected animals ought to be burned. Healthy 
cattle should be kept off from pastures in which such animals have 
run. As the time during which the bacteria remain alive outside of 
the body is not known, it is impossible to indicate the period during 
which infected pastures are dangerous to other cattle. It is stated 
by O. Bang that cattle imported from countries known to be affected 
with this disease should be tested with avian tuberculin to detect the 
infected individuals. 
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