24 
JSToeth Carolina Experiment Station 
ance in these specific outbreaks, nor make light of the fact that in Figure 8 
the dog was a possibility in the spread of the infection. 
The common range ground is a common means of disseminating the dis¬ 
ease in the flock and within flocks. Flocks ranging on the same grounds 
contract the disease through ingesting feed soiled by droppings of birds 
having the disease, or which are in the carrier stage. Such a condition prob¬ 
ably caused the outbreak shown in Figure 10. 
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FIG. 10.—FIELD STUDY OF FOWL TYPHOID 
Man and domestic animals, or wild animals, may also act as conveying 
agents of this and other avian diseases, though actual data on such means 
of transmission is difficult to obtain. 
Other outbreaks investigated occurred with no traceable infecting agent. 
These occurred with an initial foci, and were featured by a progressive 
spread of the contagium, the flock outbreaks occurring at relatively regular 
intervals. Such outbreaks generally wear themselves out after covering a 
certain territory, but recurrence of the disease is probable in the infected 
area. Outbreaks with no traceable transmitting agent are shown in Figures 
11 and 12. 
