There are undoubtedly Predisposing conditions which contribute toward the development of the disease; some of these are found in the animal body and others in the environment.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
The Predisposing cause is unknown.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Poor condition, weakness, and a too watery state of the blood is often a Predisposing cause.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler