Cytomegalovirus (CMV) Glycoprotein B Genotypes and Response to Antiviral Therapy, in Solid‐Organ–Transplant Recipients with CMV Disease

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Abstract
Cytomegalovirus (CMV) can be classified into 4 glycoprotein B (gB) genotypes, on the basis of sequence variation in the UL55 gene. We assessed the effect that CMV gB genotype has on virologic and clinical response to therapy, in 50 solid-organ–transplant recipients with CMV disease. CMV loads were determined at regular intervals after the start of therapy. Genotype results were correlated with CMV-load kinetics in response to therapy with ganciclovir. At the onset of treatment, the distribution of CMV gB genotypes was as follows: gB1, 19/50 (38%); gB2, 9/50 (18%); gB3, 12/50 (24%); gB4, 2/50 (4%); and mixed-genotype infection, 8/50 (16%). Between viral genotype groups, time to clearance of CMV, failure to clear CMV, and calculated CMV-load half-life after the start of therapy were not significantly different. The CMV gB genotype did not affect the rate of disease recurrence or occurrence of tissue-invasive disease. It appears that the gB genotype, which causes CMV disease, does not significantly influence CMV-load kinetics or clinical response to therapy

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