Al·pha·vi·rus noun \ˈal-fə-ˌvī-rəs\
: a genus of single-stranded RNA viruses of the family Togaviridae that are transmitted by arthropods and especially mosquitoes and that include the Mayaro virus, Semliki Forest virus, Sindbis virus, and the causative agents of chikungunya and equine encephalitis
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