Abstract
Immunoglobulin G to human herpesvirus 6 (HHV-6) and cytomegalovirus (CMV) in sera from solid organ recipients was measured by an enzyme-linked immunoassay (ELISA) before and after transplant. The HHV-6 ELISA was developed from glycine extracts of HHV-6-infected and uninfected HSB-2 cells. At a serum dilution of 1:500, 80 (91%) of 88 recipients were seropositive for HHV-6 before transplant, while only 14 (16%) were seropositive for CMV. Posttransplant HHV-6 serologic rises were observed in 38 (43%) recipients; rises in 25 of these recipients were associated with primary CMV infection. Titration of sera revealed much higher HHV-6 titer rises among those with primary CMV infection than among those with CMV reactivation or with no CMV infection. Elevated HHV-6 antibody titers persisted for up to 2 years after primary CMV infection. No correlation was noted between CMV and HHV-6 antibody titers in individual serum samples.
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