| alphavirus | A genus of togaviridae, also known as group a arboviruses, serologically related to each other but not to other togaviridae. The viruses are transmitted by mosquitoes. The type species is the sindbis virus. (12 Dec 1998) |
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| alphavirus infections | Virus diseases caused by members of the alphavirus genus of the family togaviridae. (12 Dec 1998) |