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Abstract
In this study, we have established a Staphylococcus aureus RpoB H481Y mutant strain and demonstrated that it is sensitive to menadione or hydrogen peroxide-induced oxidative stress and exhibits reduced virulence against a silkworm infection model. Furthermore, the reduced virulence of the RpoB H481Y mutant was abrogated in the presence of N-acetylcysteine, a reactive oxygen species scavenger. These results suggest that oxidative stress sensitivity caused by the RpoB H481Y rifampicin resistance mutation attenuates the virulence of S. aureus.
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