Because of the possibility of severe complications.
CMV can have effects on several organs and cause rejection.
In very rare cases, EBV can result in lymphoproliferative syndrome (PTLD), which is a precursor to lymphoma (early stage).
And the chickenpox virus can cause many complications in a child who did not develop immunity before transplantation.
A characteristic of these three viruses is that they remain inactive in cells and reappear later, which makes it difficult to treat them. Please feel free to contact the Center if you have any questions.