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Abstract
A method for the determination of specific IgM antibodies to C100 protein, a hepatitis C virus-associated antigen, was developed which employed fractionation of serum proteins by gel chromatography and an enzyme-linked immunosorbent assay. Detection of IgM anti-C100 proved to be specific and reproducible in purified IgM fractions. Separation of IgM from IgG was necessary before IgM could be measured, because of the detrimental effect of the simultaneous presence of IgG antibodies with anti-C100 rectivity on IgM determination. IgM anti-C100 was not found in sera containing rheumatoid factors or IgM antibodies to other hepatotropic viruses. IgM anti-C100 was detected in 19 (44%) of 43 patients with hepatitis C virus-related chronic liver disease. When compared with the histological picture of liver disease, IgM anti-C100 was absent in patients with minimal changes and was most common (66.7%) in patients with progressive disease. It is suggested that IgM anti-C100 could reflect an active state of hepatitis C virus infection.
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