is highly variable across different isolates of N. meningitidis. To deal with this variability, hexavalent and non-hexavalent engineered vaccines have been developed to over-express different PorA subtypes
is highly variableacross different isolates of N. meningitidis. To dealwith this variability, hexavalent and non-hexavalent engineeredvaccines have been developed to over-express differentPorA subtypes