By Dr. P.H. Mapham, BVSc (Hon) and Dr. J.H. Vorster, BVSc, MMedVet(Path) Introduction According to Dr PG Marais heartwater was first diagnosed in the North-eastern Transvaal in 1838 (now Mpumalanga) and he makes the interesting comment that the actual origin of the disease is unknown and that it is doubtful whether the disease is indigenous to South… Continue Reading