Chronological comparison between genetic contexts of qnrE1 genes carried by S. enterica serovars (A, C, D, E, F, and G) and K. pneumoniae (B and H) strains isolated in South America. Genes and shotgun sequences were extracted from the GenBank database. Arrows indicate the positions and directions of the genes; Δ indicates truncated genes. Regions with >99% identity are indicated with purple shading. (A, D, and G) Strains contain ahp genes of 1,035 bp. (B) Strain contains an ahp gene of 438 bp. (C, E, F, and H) Strains contain ahp genes of 327 bp.