A commercial antibody capture enzyme immunoassay (Rubenz M) was compared to two commercial indirect enzyme immunoassays (Enzygnost IgM, Rubazyme-M) for the detection of rubella-specific IgM. Five hundred and fifty-two sera collected between the day of onset and 272 days after the onset of the exanthem of primary rubella were tested. Rubenz M was more sensitive early and late after the onset of the exanthem than the two indirect ELISAs. Rubenz M also appeared more sensitive when 240 sera were examined from patients with possible rubella in pregnancy, reinfection in pregnancy, suspected intrauterine infection, and recent vaccination. However, 5.5% of 968 pregnant women with no history of rubellalike symptoms or recent vaccination, the majority with elevated HAI titers, gave a low-positive or borderline result with Rubenz M. None of these women delivered a congenitally infected child. Therefore, borderline and low-positive results must be interpreted with caution, as for any assay for rubella-specific IgM.
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