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Table 2 No. of isolates in different MICs and antimicrobial resistance of Salmonella isolates (n = 84)

From: Characterization of Salmonella spp. isolated from chickens in Central China

No. of isolates in different MICs & resistance rates
Serotypes Ampicillin   Cefotaxime   Meropenem   Gentamicin   Tetracycline  
≤8 16 ≥32   ≤1 2 ≥4   ≤1 2 ≥4   ≤4 8 ≥16   ≤4 8 ≥16  
SEa(14) 0 0 14 100.0 14 0 0 0.0 8 1 5 35.7 14 0 0 0.0 0 1 13 92.9
STb(11) 0 0 11 100.0 11 0 0 0.0 5 5 1 9.1 11 0 0 0.0 6 2 3 27.3
SGc(16) 2 0 14 87.5 7 5 4 25.0 16 0 0 0.0 13 3 0 0.0 2 1 13 81.3
SGPd(38) 0 0 38 100.0 33 3 2 5.3 34 4 0 0.0 35 2 1 2.6 22 0 16 42.1
OTe(5) 0 0 5 100.0 4 1 0 0.0 3 2 0 0.0 5 0 0 0.0 1 0 4 80.0
Total(84)    82 97.6    6 7.1    6 7.1    1 1.2    49 58.3
No of isolates in different MICs & resistance rates
Subspecies Tigecycline   Chloramphenicol   Ciprofloxacin   Trimethoprim-sulfamethoxazole   Colistin  
≤2 4 ≥8   ≤8 16 ≥32   ≤1 2 ≥4   ≤2/38 – ≥4/76   ≤2 4 ≥8  
SEa(14) 14 0 0 0.0 8 1 5 35.7 8 2 4 28.6 7 0 7 50.0 2 3 9 64.3
STb(11) 9 2 0 0.0 6 1 4 36.4 10 0 1 9.1 7 0 4 36.4 4 4 3 27.3
SGc(16) 13 2 1 6.3 7 0 9 56.3 16 0 0 0.0 14 0 2 12.5 5 6 5 31.3
SGPd(38) 33 2 3 7.9 27 2 9 23.7 35 3 0 0.0 32 0 6 15.8 5 10 23 60.5
OTe(5) 5 0 0 0.0 3 0 2 40.0 4 1 0 0.0 4 0 1 20.0 2 0 3 60.0
Total(84)    4 4.8    29 34.5    5 6.0    20 23.8    43 51.2
  1. aS. Enteritidis; bS. Typhimurium; cS. Gallinarum; dS. Pullorum; eother serotypes;
  2. Escherichia coli ATCC 25922 was the quality control, the detailed results are as follows, ampicillin (8 μg/ml), cefotaxime (0.12 μg/ml), meropenem (< 0.125 μg/ml), gentamicin (1 μg/ml), tetracycline (1 μg/ml), tigecycline (0.25 μg/ml), chloramphenicol (4 μg/ml), ciprofloxacin (0.015 μg/ml), trimethoprim-sulfamethoxazole (0.5/9.5 μg/ml) and colistin (2 μg/ml)
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