Table 2.

Prevalence of HHV6 and HHV7 in the civilian population: healthy adults versus the stratified CFS subsets

PBMC donorsNo. with virus/no. tested (%)
HHV6aHHV7bEither HHV6 or HHV7Both HHV6 and HHV7
Healthy adults19/71 (26.7%)51/73 (69.9%)56/73 (76.7%)14/71 (19.7%)
CFS patients26/74 (35.1%)58/75 (77.3%)61/76 (80.3%)23/73 (31.5%)
  P valuec 0.290.350.690.13
CFS patients with axis I diagnosis11/32 (34.4%)24/31 (77.4%)27/32 (84.4%)8/31 (25.8%)
CFS patients without axis I diagnosis15/42 (35.7%)34/44 (77.3%)34/44 (77.3%)15/42 (35.7%)
  P valuec 0.550.650.700.17
CFS patients reporting acute onset17/52 (32.7%)41/53 (77.4%)42/53 (79.3%)42/53 (79.3%)
CFS patients reporting gradual onset9/22 (40.9%)17/22 (77.3%)19/23 (82.6%)19/23 (82.6%)
  P valuec 0.430.600.890.26
  • a Two CFS and healthy adult control donor samples were omitted from the HHV6 PCR analysis because a definitive determination as to the presence or absence of viral DNA could not be made.

  • b One CFS patient sample was omitted from the HHV7 PCR analysis because a definitive determination as to the presence or absence of viral DNA could not be made.

  • c Determined by Fisher’s exact test.