Detection of HHV-6 genome in SAS413 and SAS527 by PCR. A PCR product of the expected size was detected in HHV-6A–inoculated SAS413 (lane 1), HHV-6B–inoculated SAS413 (lane 2), HHV-6A–inoculated SAS527 (lane 4), and HHV-6B–inoculated SAS527 (lane 5), but not in uninfected SAS413 (lane 3) or SAS527 (lane 6). DNA was extracted from HHV-6A–inoculated SAS413 at day 6 after virus inoculation, and from HHV-6B–inoculated SAS413, HHV-6A–inoculated SAS527, and HHV-6B–inoculated SAS527 at day 240. Lane M shows marker DNAs.