Why it's important not to scare people by telling them the truth about HHV-6
Prospective Characterization of the Risk Factors for Transmission and Symptoms of Primary Human Herpesvirus Infections Among Ugandan Infants
"HHV infections are lifelong, and in addition to directly causing pathology in large numbers of individuals, they also form an important part of the human virome that may affect subsequent immune responses to infectious pathogens and allergens."
http://jid.oxfordjournals.org/content/early/2016/03/22/infdis.jiw076.long