该病毒最早于1931年确定，当时正在对肯尼亚里夫特山谷一农庄羊群中的一种流行病进行调查。
The virus was first identified in 1931 during an investigation into an epidemic among sheep on a farm in the Rift Valley of Kenya.
在里夫特山谷的Munyaka PCEA营地，现已收容了大约3000人，有自来水，但无蓄水箱。
The Munyaka PCEA Camp in the Rift Valley hosts about 3000 residents, and has running water but no storage tanks.
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