Clinical Relevance of High HHV-6B Viral Load in Immunocompromised Host

The peculiarity of the chromosomally integrated form of human herpesvirus type 6 (ciHHV-6) is its wide distribution (up to 1% of the population), the possibility of transmission by inheritance, the problem of diagnosis, including issues of differential diagnosis with the acute form of HHV-6 infection, which, in turn, makes it difficult to resolve the problem of the therapy necessity. In addition, activation of ciHHV-6 is possible sometimes with acute infection clinical symptoms and the need for antiviral therapy, especially in patients after bone marrow transplantation and chemotherapy. We report a 10-years-old girl after chias- mal-sellar germinoma surgery and subsequent chemotherapy with ciHHV-6B. The child was treated with ganciclovir. This did not significantly influence the reduction of the viral load HHV-6B DNA in serum and cerebrospinal fluid. No adverse effects of antiviral treatment were registered. It’s important to exclude ciH- HV-6 before the diagnosis of HHV-6 active disease is made, as this screening may prevent the unnecessary use of antivirals.