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We developed and evaluated a rapid and simple multiplex microsphere assay for the quantification of specific IgG and IgA antibodies against meningococcal serogroup A, C, W, and Y capsular polysaccharides in serum and saliva. Meningococcal polysaccharides were conjugated to distinct magnetic carboxylated microspheres, and the performance of the assay was assessed using the CDC1992 standard meningococcal reference serum and a panel of serum and saliva samples. The standard curve was linear over an eight 3-fold dilution range in the IgG assay and a seven 3-fold dilution range in the IgA assay. No cross-reactivity was discovered, and the assay showed high specificity with ≥91% homologous inhibition and ≤11% heterologous inhibition for all serogroups and immunoglobulin classes. Lower limits of detections were ≤280 pg/ml for IgG and ≤920 pg/ml for IgA antibodies. The assay was reproducible, with a mean coefficient of variation of ≤5% for intra-assay duplicates, a mean coefficient of variation of ≤20% for interassay repeated analysis with different conjugations of microspheres, and a mean coefficient of variation within 25.8% for interoperator variation. The assay showed good correlation to the standard meningococcal polysaccharide enzyme-linked immunosorbent assay (ELISA) for detection of serum antibodies. This multiplex assay is robust and reliable and requires less sample volume, and less time and workload are needed than for ELISA, making this method highly relevant for serological and salivary investigations on the effect of meningococcal vaccines and for immunosurveillance studies.

clinical and vaccine immunology

Development and Evaluation of a Multiplex Microsphere Assay for Quantitation of IgG and IgA Antibodies against Neisseria meningitidis Serogroup A, C, W, and Y Polysaccharides