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Table 2 Statistical analysis of the results of antimicrobial susceptibility testing of 21 antibiotics for 44 S. sonnei isolates

From: Molecular characterization of fluoroquinolone and/or cephalosporin resistance in Shigella sonnei isolates from yaks

Antimicrobial Antimicrobial resistance rate [No. (%)]
Total (n = 44) Gansu (n = 24) Qinghai (n = 15) Tibet (n = 5)
phase I (n = 20) phase II (n = 4) phase I (n = 10) phase II (n = 5) phase I (n = 3) phase II (n = 2)
Norfloxacin 10 (22.73%) 4 (20%) 1 (25%) 3 (30%) 1 (20%) 1 (33.33%) 0
Enrofloxacin 12 (27.27%) 5 (25%) 1 (25%) 3 (30%) 1 (20%) 2 (66.67%) 0
Levofloxacin 4 (9.09%) 3 (15%) 0 1 (10%) 0 0 0
Ciprofloxacin 0 0 0 0 0 0 0
Ofloxacin 0 0 0 0 0 0 0
Penicillin G 44 (100%) 20 (100%) 4 (100%) 10 (100%) 5 (100%) 3 (100%) 2 (100%)
Ampicillin 31 (70.45%) 15 (75%) 3 (75%) 8 (80%) 3 (60%) 1 (33.33%) 1 (50%)
Amoxicillin/clavulanic acid 0 0 0 0 0 0 0
Cephalothin 13 (29.55%) 7 (35%) 0 5 (50%) 0 0 1 (50%)
Cephazolin 14 (31.82%) 7 (35%) 1 (25%) 5 (50%) 0 0 1 (50%)
Cefoxitin 4 (9.09%) 0 0 4 (40%) 0 0 0
Ceftriaxone 9 (20.45%) 4 (20%) 0 5 (50%) 0 0 0
Cefotaxime 5 (11.36%) 2 (10%) 0 3 (30%) 0 0 0
Cefepime 0 0 0 0 0 0 0
Meropenem 0 0 0 0 0 0 0
Imipenem 0 0 0 0 0 0 0
Chloramphenicol 4 (9.09%) 0 0 3 (30%) 1 (20%) 0 0
Tetracycline 30 (68.18%) 14 (70%) 2 (50%) 8 (80%) 3 (60%) 2 (66.67%) 1 (50%)
Streptomycin 14 (31.82%) 5 (25%) 2 (50%) 5 (50%) 1 (20%) 0 1 (50%)
Gentamicin 12 (27.27%) 6 (30%) 0 5 (50%) 1 (20%) 0 0
Amikacin 0 0 0 0 0 0 0