Wiktionary
roseolovirus
n. Any member of the genus (taxlink Roseolovirus genus) of viruses causing roseola.
Wikipedia
Roseolovirus
Roseolovirus is a genus of viruses in the order Herpesvirales, in the family Herpesviridae, in the subfamily Betaherpesvirinae. Humans serve as natural hosts. There are currently three species in this genus including the type species Human herpesvirus 6A. Diseases associated with this genus include: HHV-6: sixth disease ( roseola infantum, exanthem subitum); HHV-7: symptoms analog to the 'sixth disease'.