Ganciclovir
Ganciclovir has also been used with some success in treating "Human herpesvirus 6" infections.
Human polyomavirus 6
HPyV6 was first discovered in 2010 by rolling circle amplification, a genetic technique that efficiently amplifies and detects circular DNA, such as a polyomavirus genome. It was identified as a component of skin flora in healthy adults, along with Merkel cell polyomavirus (which can cause Merkel cell cancer) and Human polyomavirus 7.