Some digging around in historical records revealed that there was a change in the incidence of water-borne disease at that time, especially dysentery.

一些历史记录显示，当时水源性疾病的发病率发生了变化，尤其是痢疾。

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But 800 million are still at risk of water-borne disease.

但是还有8亿人仍然受到着水生疾病的威胁。

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But 800 million are still at risk of water-borne disease. Katherine Harmon reports.

但是还有8亿人仍然受到着水生疾病的威胁。

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Health officials say the water-borne disease is spreading fast because of the poor sanitation or contaminated water which Zimbabweans are using for drinking and to prepare food.

CNN: Cholera kills 300 in battered Zimbabwe