Human herpes virus 6 (HHV-6) has been implicated as a human pathogen in bot
h normal and immunocompromised hosts. It has been associated with interstit
ial pneumonitis and bone marrow suppression after transplantation. We repor
t here a case of fatal encephalitis in a bone marrow transplant recipient.
This case illustrates the importance of considering HHV6 as an emerging pat
hogen in immunocompromised hosts.