If the HHV-6 virus is poitive at anypoint in our History... even with only rare oral breakouts.... I wonder if taking Valtrex on a regular basis or at least for awhile may do some good?? Could this virus be causing fatigue and other symptoms of CFS as it lay in your system just waiting for an opportunity to strike?? (even when it isn't actively showing itself?) Has anyone heard anything one way or the other? If anyone has heard about valtrex and CFS I would love to hear it! Thanks, Susan B.