Human herpesvirus type 6 (HHV6) is known to reactivate after hematopoetic stem cell transplantation\ud (HSCT) and has been suggested to be associated with increased mortality and severe clinical manifestations,\ud including graft versus host disease (GvHD). The exact etiological role of HHV6 reactivation in\ud increased morbidity and mortality after HSCT remains unclear. This review will focus on the current\ud available evidence of HHV6 reactivation after HSCT and its immuno-modulatory capacities, with particular\ud emphasis on the severe complication GvHD. At present, no effective specific antiviral treatment for\ud HHV6 reactivation has been identified. The currently available antiviral agents are outlined, aswell as possible\ud future strategies for the treatment of HHV6 reactivation. Non-toxic, specific treatment or prevention\ud of HHV6 reactivation might improve the safety and efficacy of the HSCT procedure
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