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Chromosomal mutations conferring fluoroquinolone (FQ) resistance. Sequencing results of the quinolone resistance- determining regions (QRDR) of 460 nalidixic acid-resistant (NalR) S. enterica isolates. For each serotype (number sequenced [n]), the percentage of isolates displaying a QRDR-related mutation in their gyrA or parC genes is shown. wt, wild-type.
