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The Journal of Medical Microbiology, Vol 11, Issue 4 411-418, Copyright © 1978 by Society for General Microbiology

JOURNAL ARTICLE

Comparison of methods for detecting specific IgM antibody in infants with congenital rubella

J. R. Pattison, C. M. Jackson, J. A. Hiscock, J. E. Cradock-Watson and M. K. Ridehalgh

Serum specimens from 14 infants with congenital rubella were examined for specific IgM antibody by six different methods. IgM-containing fractions were separated either by sucrose density-gradient centrifugation or by gel filtration through Sephadex G-200, and were then tested by the indirect immunofluorescence technique and by the haemagglutination-inhibition (HI) test (long-and short-incubation methods). Immunofluorescence staining of density-gradient fractions detected specific IgM in all 14 infants. The HI test (long method), applied to density-gradient fractions, was almost as sensitive, detecting antibody in 13 infants; the short method was less sensitive. The gel-filtration technique proved to be generally less satisfactory than sucrose density-gradient centrifugation. Evidence was obtained for the occurrence of as yet unclassified non-specific inhibitors in the serum of some infants. These inhibitors were deposited with the IgM on sucrose-density gradients and they could have been mistaken for rubella-specific IgM antibody, particularly in the HI test (long method).




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