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In 20 patients with a cadaveric renal allograft, serial measurements were made of the serum complement factors C3, C4, factor B (FB), and C3d, the stable conversion product of C3. Measurements were started immediately before transplantation and continued thereafter once a week to investigate whether these assays help to differentiate between acute allograft rejection (R) and an active cytomegalovirus (CMV) infection. Fifteen patients had one or more R episodes, and 9 patients suffered from an active CMV infection. Six patients had an R episode and subsequently a CMV infection 13-64 days after R. No significant changes were found in the levels of C3, C4, and FB during R or CMV infection. C3d levels remained unchanged or decreased slightly during R. However, there was a 43-500% increase in the C3d level during CMV infection. This difference in the behavior of levels of C3d during R and CMV infection is significant (P less than 0.01), and suggests that serial measurements of C3d may be useful in differentiating CMV infection from R after renal transplantation.
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