Article,

Circumvention of herd immunity during an outbreak of meningococcal disease could be correlated to escape mutation in the porA gene of Neisseria meningitidis

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Infection and Immunity, 69 (3): 1971--1973 (March 2001)PMID: 11179386.
DOI: 10.1128/IAI.69.3.1971-1973.2001

Abstract

Meningococcal strains isolated during an outbreak were shown to belong to the ET-5 complex and to harbor a mutation in the VR2 region of the porA gene. They were less susceptible to the bactericidal effect of normal human serum than was the ET-5 wild-type strain. These results are of concern, as PorA is a potential target in vaccine design.

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