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Clinical and Experimental Immunology logoLink to Clinical and Experimental Immunology
. 1979 Jun;36(3):415–422.

Rheumatoid factor as a cause of positive reactions in tests for Epstein–Barr virus-specific IgM antibodies

Gertrude Henle, Evelyne T Lennette, Margaret A Alspaugh, W Henle
PMCID: PMC1537758  PMID: 226299

Abstract

Sera from twenty-eight patients with rheumatoid arthritis (RA) were titrated in indirect immunofluorescence tests for Epstein–Barr virus (EBV) specific antibodies. All had IgG antibodies to viral capsid antigen (VCA), 64% at titres [unk] 320, and 71% reacted also in tests for VCA-specific IgM antibodies at titres ranging from 20 to 640. The reactions observed in the IgM test were not due to VCA-specific IgM antibodies, however, but rather to rheumatoid factor (RF) usually an IgM antibody to the Fc regions of IgG. The titres recorded in the anti-VCA IgM test correlated significantly with the RF titres and both reactivities were abolished by adsorption onto IgG coated latex particles. In addition, they clearly depended upon the height of the IgG antibody titre to VCA, indicating that the more VCA-specific IgG molecules are present the more likely it is that RF will combine with them in sufficient quantity before or after their attachment to VCA-positive test cells so as to become detectable by the fluorescent antibodies to human IgM. Results comparable in every aspect were obtained with those sera from patients with Hodgkin's disease, nasopharyngeal or cervical carcinomas which reacted in the anti-VCA IgM test. Sera from patients with infectious mononucleosis may also contain RF, but in such cases its removal by adsorption onto IgG-coated latex particles did not generally reduce the VCA-specific IgM antibody titre. Removal of RF from any of the sera studied did not affect the titres of VCA-specific IgG and, where applicable, IgA or heterophil antibody titres. These results re-emphasize the pitfall created by RF noted previously in tests for virus-specific IgM antibodies.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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