The rubella haemagglutination inhibition (HAI) test has been modified for the detection of rubella-specific IgM. The rubella HAI test is performed in microtitre plate wells in which IgM from patients' sera has been selectively retained by anti-human IgM bound to the polystyrene surface. The test requires only anti-human IgM-coated microtitre plates, in addition to the standard rubella HAI reagents. The results obtained in this test, a solid-phase immunosorbent technique (SPIT), are in good agreement with results obtained by the sucrose density gradient centrifugation technique (DGCT). Advantages include the essentially unrestricted number of sera which can be tested daily, the availability of results within 24 h and the lack of interference by rheumatoid factor and by rubella-specific IgG.


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