Sequencing of <i>Neisseria meningitidis penA</i> Gene: the Key to Success in Defining Penicillin G Breakpoints

Abstract

ABSTRACT Testing of susceptibility to penicillin G by E-test and sequencing of an internal fragment of the penA gene were done for 43 meningococcal strains. Those strains for which the MIC was ≥0.094 μg/ml showed mosaic alleles, so 0.094 μg/ml is suggested as the penicillin G intermediate breakpoint when E-test is used.