Rift Valley fever

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• noun pathology A mosquito-borne, acute, febrile, viral disease of humans and animals, caused by an RNA virus of the genus Phlebovirus, which occurs in northern and eastern Africa.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an infection common in Africa caused by a bunyavirus; transmitted by mosquitoes or by handling infected animals