Meningococcal Antigen Typing System (MATS): A Tool to Estimate Global Coverage for 4CMenB, a Multicomponent Meningococcal B Vaccine.

Meningococcal Antigen Typing System (MATS) is the combination of a sandwich ELISA (Enzyme Linked Immunosorbent Assay) developed to estimate the level of expression and immunoreactivity of the antigen components (fHbp, NHBA, and NadA) of the 4CMenB vaccine (Bexsero, GSK Vaccines) in circulating, serogroup B meningococcal (MenB) strains, with the molecular typing of PorA, the main antigenic component in the outer membrane vesicles (OMV). MATS has been proven to be a good surrogate of the accepted correlate of protection for meningococcus (hSBA), thus providing a quick, conservative and reproducible method to assess vaccine coverage. The method has been successfully transferred and standardized in several public health laboratories across Europe, North America, and Australia and used to screen thousands of isolates all over the world. Here we describe the sandwich ELISA method applied to assess the expression and cross-reactivity of fHbp, NHBA, and NadA in MenB isolates.