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A solid-phase immunosorbent technique (SPIT) was adapted to detect Rift Valley fever (RVF) virus-specific immunoglobulin M (IgM) in serum samples from humans vaccinated with Formalin-inactivated RVF vaccine. Microdilution plates coated with goat anti-human IgM were successively incubated with serum samples from human vaccinees, RVF virus hemagglutinating antigen, and goose erythrocytes. The RVF virus-specific IgM in the serum samples from vaccinees bound to the RVF virus antigen and inhibited hemagglutination of goose erythrocytes. SPIT was compared to the IgM capture enzyme linked immunosorbent assay (ELISA) and the indirect immunofluorescent-antibody (IFA) assay and was found to be sensitive in detecting RVF virus-specific IgM antibody, with high correlations between SPIT and the other two tests (Pearson's correlation coefficient [r] = 0.9 and 0.6, respectively). Results of SPIT were obtained within 5 h, offering speed over ELISA (8 h). In addition, SPIT does not require sophisticated equipment or expensive reagents. Serum rheumatoid factor did not produce false-positive reactions in SPIT as in the indirect immunofluorescent-antibody assay and IgM capture ELISA.

Solid-phase immunosorbent technique for rapid detection of Rift Valley fever virus immunoglobulin M by hemagglutination inhibition