HHV-6 hasn't come up for a while, but it's interesting that they are testing anti-viral compounds against HHV-6. It isn't MS-specific right now, but they mention MS.
Efficacy of antiviral compounds in human herpesvirus-6-infected glial cells.
J Neurovirol. 2006 Aug;12(4):284-93.
Akhyani N, Fotheringham J, Yao K, Rashti F, Jacobson S.
Viral Immunology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, USA.
The beta-herpesvirus human herpesvirus-6 (HHV-6) is becoming increasingly ...