Abstract
Several antisera raised against outer membane vesicles obtained from invasive and carrier Neisseria meningitidis strains and commensal Neisseria and Moraxella catharralis species were assayed to test cross-bactericidal activity on Neisseria meningitidis strains. Results demonstrate that, despite the wide antigenic cross-reactivity previously shown by Western-blotting for the major outer membrane antigenic proteins of all Neisseria species, complement mediated killing shows very variable patterns that can not be predicted on the basis of antigenic cross-reactivity. Results of antibody tritations on homologous and heterologous strains, isotyping, and bactericidal activity of sera raised against denatured purified outer-membrane vesicle proteins, suggest that the responsibility for most of the bactericidal activity of the sera must be conformational and/or shared epitopes not detectable by Western-blotting.
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