A new study analyzed HHV-6 genetic sequences in the cord blood of infants with transplacentally-acquired HHV-6. The sequences were found to be identical to those of their ciHHV-6 mothers, and divergent from the sequences of other known HHV-6 strains. These findings suggest that ciHHV-6 can become reactivated and then acquired transplacentally, contributing to the newly described HHV-6 congenital infection. READ MORE