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In page Nongqawuse:

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During this time, many Xhosa herds were plagued with "lung sickness",[citation needed] possibly introduced by European cattle. Mhlakaza did not believe her at first but when Nongqawuse described one of the men, Mhlakaza (himself a diviner) recognised the description as that of his dead brother and became convinced she was telling the truth.[1] Mhlakaza repeated the prophecy to Sarili. The cattle-killing frenzy affected not only the Gcaleka, Sarili's clan, but the whole of the Xhosa nation. Historians estimate that the Gcaleka killed between 300,000 and 400,000 head of cattle.[2]