Abstract
The clinical significance of human herpesvirus (HHV-6) infections after allogeneic stem cell transplantation (SCT) remains controversial. We analysed cryoconserved plasma samples from 82 patients after allogeneic SCT by quantitative polymerase chain reaction for HHV-6 variants A and B. Platelet engraftment was delayed in patients with HHV-6B infections but not with HHV-6A infections detected before day +28. In multivariate analysis early HHV-6B infections and the type of conditioning were associated with platelet engraftment. In conclusion, the two variants of HHV-6 should be studied separately; early infections with HHV-6B may contribute to delayed platelet engraftment after allogeneic SCT.
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