Comparison of immunofluorescence and radioimmunoassay for detecting IgM antibody in infants with the congenital rubella syndrome

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Abstract
Immunofluorescence (IF) and radioimmunoassay (RIA) were compared for detecting Ig[immunoglobulin]M antibody in 124 infants with confirmed or suspected congenital rubella. IF was used to test sucrose density gradient fractions and RIA to test fractions and whole serum. When fractions were tested, IF and RIA were equally specific and distinguished clearly between IgM and IgG, but RIA was more sensitive. The RIA titer in whole serum was always greater than in the peak IgM fraction and there was no evidence that testing the serum, rather than the fraction, could result in failure to detect IgM. With some sera RIA gave low titers which became negative after absorption with IgG-coated latex beads. The mechanism of this false positive effect, which may have been due to IgM with anti-IgG activity, was not investigated, but if it can be removed by absorption it need not reduce the specificity of the test. During the first 6 mo. of life, IgM antibody was detected by RIA in 30 of 32 unfractionated sera and by IF in fractions from 28 of these. After the age of 6 mo., IgM was found progressively less frequently and the greater sensitivity of RIA became a more obvious advantage: 17 of 60 specimens were positive by RIA and 11 of these were negative by IF. RIA testing of whole serum appears to be an economical, specific and sensitive method for detecting IgM antibody in congenital rubella, of particular value when the antibody titer is low.