Meningococcal infection usually confers immunity in the form of bactericidal antibodies to both the infecting and unrelated strains of meningococci. Recurrent attacks are rare and documentation of the serogroup involved in both episodes of such attacks is rarer still. A case of recurrent group B meningococcal disease occurred in a child who developed bactericidal antibodies to both infecting strains. Both serogroup and serotype antigens of the two infecting strains were identical.
(JAMA 229:68-70, 1974)