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Susceptibilities of Neisseria gonorrhoeae Isolates Containing Amino Acid Substitutions in GyrA, with or without Substitutions in ParC, to Newer Fluoroquinolones and Other Antibiotics

ABSTRACT We examined the antimicrobial susceptibilities of 85Neisseria gonorrhoeae isolates, classified according to the presence of amino acid substitutions in the GyrA and ParC proteins, to 12 fluoroquinolones and 7 other antibiotics. Sitafloxacin and HSR-903 showed excellent activity against N. gonorrhoeae, including strains with both GyrA and ParC substitutions. Among the strains with various GyrA substitutions, strains with a serine-91-to-phenylalanine mutation required the highest MICs of all of the fluoroquinolones tested and were cross-resistant to structurally unrelated β-lactams.