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Nucleotide mutations inside a core region of the rpoB gene, encoding the β subunit of RNA polymerase, were found in rifaximin-resistant mutants of Bifidobacterium. Five different missense mutations of codons 513, 516, 522 and 529 were identified. Further aspects of rifaximin resistance were investigated, using Bifidobacterium infantis BI07 as a model strain. Partial resistance of RNA polymerase of...
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