HHV-6, CMV and HSV1/2 were the most likely to reactivate, but herpesvirus reactivation was just as likely prior to chemotherapy.
HHV-6 and enterovirus confirmed as the leading cause “fever without source” in young children
A Swiss team studied 134 young children who were experiencing unidentified high fevers and were able to find at least one virus in 35% of those patients. The two biggest culprits were enterovirus (14%) and HHV-6 (11%).