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Genetic Characteristics: Serovar Paratyphi B has been found to be polyphyletic with four phylogenetic groups lineages identified. A study of 568 isolates found that antimicrobial resistance is fairly recent for this serovar and is mostly related to resistance to quinolones. Serovar Paratyphi B sequence type 28 has been highly found in poultry from Europe and Latin America with resistance to beta-lactams and quinolones.
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