Description: Segment 1 Archive footage of Zululand is seen. The narrator explains that in the C19th, local cattle were dying of a mysterious disease. Zulus suspected that wild game animals were infecting their cattle somehow. Westerners who came to the area to hunt also noticed that their horses were dying, but thought that it was due to the bite of the tsetse fly. The Governor of Zululand, Sir Walter Hely-Hutchinson, called in David Bruce of the Army Medical Service to investigate why so many animals were dying. In 1915, David Bruce presented a paper to the Royal College of Physicians, and a dramatic reconstruction of Bruce writing his talk is seen. Leon Sinden as David Bruce describes his arrival in Zululand and how his laboratory was set up. He examines affected cattle but finds no bacteria in the blood or organs. However, further study of the blood revealed a curiously shaped object moving among the blood cells. This was the ngana parasite. Time start: 00:00:00:00 Time end: 00:05:58:20 Length: 00:05:58:20 Segment 2 A magnified view of blood is shown, with the ngana parasite moving around. David Bruce suspects that the tsetse fly disease and the ngana disease are the same and so purposefully infects some oxen and some dogs with the tsetse fly. He finds the same parasites in their blood. In 1896 he shipped an infected dog back to England, allowing further study. Time start: 00:05:58:20 Time end: 00:11:04:24 Length: 00:05:06:04