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Multidrug-resistant (MDR)  Salmonella enterica  has been deemed a high-priority pathogen by the World Health Organization. Two hundred and sixty-four  Salmonella enterica  isolates recovered over a 16-year period (2000 to 2016) from the poultry and swine production chains, in Brazil, were investigated by whole-genome sequencing (WGS). Most international lineages belonging to 28 serovars, including,  S .  enterica  serovars  S . Schwarzengrund ST96,  S . Typhimurium ST19,  S . Minnesota ST548,  S . Infantis ST32,  S . Heidelberg ST15,  S . Newport ST45,  S . Brandenburg ST65 and  S . Kentucky ST198 displayed MDR and virulent genetic backgrounds. In this regard, resistome analysis revealed presence of  qnrE1  (identified for the first time in  S . Typhimurium from food chain),  qnrB19, qnrS1 ,  bla  CTX-M-8 ,  bla  CTX-M-2  and  bla  CMY-2  genes, as well as  gyrA  mutations; whereas ColpVC, IncHI2A, IncHI2, IncFIA, Incl1, IncA/C2, IncR, IncX1 and po111 plasmids were detected. In addition, phylogenetic analysis revealed multiple independent lineages such as  S .  enterica  serovars  S . Infantis,  S . Schwarzengrund,  S . Minnesota,  S . Kentucky and  S . Brandenburg. In brief, ocurrence and persistence of international lineages of  S .  enterica  serovars in food production chain is supported by conserved genomes and wide virulome and resistome.

Genomic Features of High-Priority Salmonella enterica Serovars Circulating in the Food Production Chain, Brazil, 2000–2016