1948356 MACRIA M-antibody capture radioimmunoassay 17 1948353 MACRIA mu-capture radioimmunoassay 2 1948352 MACRIA IgM antibody capture assay 1 1948357 MACRIA M-antibody capture RIA 1 1948354 MACRIA measles IgM, using a reference radioimmunoassay 1 1948355 MACRIA measured by an IgM antibody capture radioimmunassay 1