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. 1989 May;27(5):952–958. doi: 10.1128/jcm.27.5.952-958.1989

Rapid diagnosis of acute Epstein-Barr virus infection by an indirect enzyme-linked immunosorbent assay for specific immunoglobulin M (IgM) antibody without rheumatoid factor and specific IgG interference.

D W Ho 1, P R Field 1, A L Cunningham 1
PMCID: PMC267461  PMID: 2545744

Abstract

An indirect enzyme-linked immunosorbent assay (ELISA) for detection of Epstein-Barr virus-specific immunoglobulin M (IgM) antibody was developed with commercial reagents. Sera containing rheumatoid factor (RF) (as little as 0.5 IU/ml) coupled with specific IgG resulted in false-positives in the ELISA. This interference was eliminated by the use of anti-human IgG antibodies to remove RF and IgG. Thus, pathogen-specific IgG complexes to which IgM-RF could be bound during the subsequent test were inhibited, and competition between specific IgG and IgM was also prevented. Of the 1,672 serum specimens tested, 353 were found to be Epstein-Barr virus IgM antibody positive by indirect immunofluorescence (IF). Compared with the IF test, the ELISA showed 96.6% sensitivity, 99.7% specificity, and 99% accuracy. Further evidence indicated that most of the 12 ELISA false-negatives were IF false-positives. There was a linear correlation between mean ELISA values and increasing IF titers (r = 0.96). However, the IF test has the disadvantages that it lacks automated reading and requires considerable technical expertise, both of which restrict the range of laboratories performing the test. The indirect ELISA has the advantages that it is simple and rapid and can be automated. All the reagents used in this assay are commercially available, have been prestandardized, and are stable.

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Selected References

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