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Medical Definition of O'nyong-nyong fever
1. A dengue-like disease caused by the o'nyong-nyong virus, a member of the family Togaviridae, and transmitted by a mosquito, characterised by joint pains and notable lymphadenopathy followed by a maculopapular eruption of the face which extends to the trunk and extremities but fades in several days without desquamation. (05 Mar 2000)