Pullorum strains showed an increasing trend resistance to trimethoprim/sulfamethoxazole and tetracycline from 2020 to 2021 (Fig. 5 A).
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Antimicrobial resistance and clonal relationships of Salmonella enterica Serovar Gallinarum biovar pullorum strains isolated in China based on whole genome sequencing.
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The results showed that 95.7% (45/47), 93.6% (44/47), and 21.3% (10/47) of the strains isolated from 2020 were resistant to amoxicillin, ampicillin, and gentamycin, respectively, indicating that Salmonella strains isolated from 2020 showed a decreasing trend in resistance to these three antimicrobials compared to strains isolated from 2021.