Ganciclovir
Ganciclovir has also been used with some success in treating "Human herpesvirus 6" infections.
Human polyomavirus 6
HPyV6 is closely related to HPyV7, which was discovered at the same time; the two viruses' genomes share 68% sequence identity. In the 2015 taxonomic update to the polyomavirus group, the International Committee on Taxonomy of Viruses classified HPyV6 as the type species of the genus "Deltapolyomaviridae". This group contains only four viruses, all of which infect humans: HPyV6, HPyV7, MW polyomavirus, and STL polyomavirus.