NATURAL TRANSMISSION OF TRYPANOSOMIASIS. 41 



With regard to (6) and (c), these deductions are fully borne out by experience in 

 this territory where fly-struck cattle have been freely moved into fly-free areas in the 

 past. These movements have not resulted in establishing trypanosomiasis in any 

 area away from the fly belts. If this method of transmission can continue freely 

 and indefinitely, it is difficult to understand why the disease has not by this time 

 become generally spread throughout the continent. 



In no instance as yet recorded in Southern Rhodesia, however, can Glossina be 

 definitely disassociated from the inception of the outbreak. The main point is, that 

 the herding of " fly-struck " cases with healthy animals is a practice attended with 

 danger, especially in the spring and summer months. 



