We analyzed lymphocytes of patients with chronic fatigue syndrome
(CFS) for the presence of human herpesvirus 6 (HHV-6) and
HHV-7 DNA. HHV-7 was present in over 80% of CFS patients and
healthy controls, while the prevalence of HHV-6 variant A
increased significantly in CFS cases (22 versus 4%; P = 0.05).
Di Luca D, Zorzenon M, Mirandola P, Colle R, Botta GA, Cassai E