Abstract

Letermovir is an antiviral agent indicated for primary prophylaxis of cytomegalovirus (CMV) infection and disease in adult allogeneic hematopoietic stem cell transplant recipients. In this case, UL97 mutation that conferred resistance to ganciclovir was seen in a patient 8 months after renal transplant. We report the off-label use of letermovir with adjunct hyperimmune CMV immunoglobulin in the successful treatment of CMV disease. This report is the first to use this combination for treatment of CMV infection with a high viral load. It contributes to the limited available literature supporting the use of letermovir in the treatment of resistant CMV, where current therapeutic options can be suboptimal due to adverse effects and the risk of cross-resistance.

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