Virus diseases caused by members of the ALPHAVIRUS genus of the family TOGAVIRIDAE.

Synonyms: O'nyong-nyong Virus Infections, Virus Infection, O'nyong-nyong, Infections, Alphavirus, O'nyong nyong Virus Infection, O'nyong-nyong Virus Infection, Ross River Virus Infection, Alpha Virus Infection, Infection, Mayaro Virus, Mayaro Virus Infections, Barmah Forest Virus Infection, Mayaro Virus Infection, Virus Infection, Mayaro, Alpha Virus Infections, Alphavirus Infection, Alphavirus Infections, Virus Infection, Alpha, Infection, Alphavirus, Infection, O'nyong-nyong Virus