#Gene_ID Gene_name Codon_pos Ref_nuc Ref_codon Res_codon Resistance PMID Mechanism Notes Required_mut gyrA gyrA 83 AGT S R,I,N,L,Y Nalidixic acid, Ciprofloxacin 12373497,9527801 Target modification Phenotype described only in association with parC mutations, unknown phenotype if the present mutation occurs alone gyrA gyrA 87 GAA E K,G,L Nalidixic acid, Ciprofloxacin 12373497,12373497,12373497 Target modification Phenotype described only in association with parC mutations, unknown phenotype if the present mutation occurs alone gyrA gyrA 97 AGT S N Nalidixic acid, Ciprofloxacin 10508034 Target modification Phenotype described only in association with parC mutations, unknown phenotype if the present mutation occurs alone parC parC 80 AGC S R,I Nalidixic acid, Ciprofloxacin 12373497,12373497 Target modification parC parC 84 GAA E A,K,T Nalidixic acid, Ciprofloxacin 12373497,9527801 Target modification