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A 9-month posttransplantation course of an allogeneic stem-cell transplant recipient (human cytomegalovirus [HCMV] serostatus, donor positive/recipient negative), in whom ganciclovir (GCV) resistance developed (UL97 mutations M460V, L595S, and C603W) on day 164 after transplantation and who developed HCMV retinitis and fatal HCMV encephalitis is presented. Virus strains isolated from secondary cultures were analyzed by UL97 restriction assays and sequencing and were compared with primary DNA extracts of the same specimens, which resulted in molecular proof of an initial HCMV strain-specific in vitro selection of the in vivo nondominant UL97 L595S-C603 mutant strain from 3 viral variants present in vivo. In addition, compartmentalization of virus present in blood and cerebrospinal fluid was found. The influence of rapidly increasing plasma virus load (to &gt;10(6) copies/mL) and oral administration of GCV on the emergence of GCV resistance is shown. These findings have strong implications for the diagnosis of HCMV drug resistance.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Ganciclovir‐Resistant Cytomegalovirus Disease after Allogeneic Stem Cell Transplantation: Pitfalls of Phenotypic Diagnosis by In Vitro Selection of an UL97 Mutant Strain