TABLE 5.

Resistance rates of Campylobacter strains isolated from different poultry production systems

Antimicrobial agentNo. (%) of resistant strains isolated froma:
Conventional broiler farms (n = 167)Organic broiler farms (n = 165)Conventional turkey farms (n = 201)Organic turkey farms (n = 161)
Ampicillin0 A5 (3.03) A63 (31.34) B10 (6.21) A
Tetracycline141 (84.43) A99 (60) B186 (92.54) C81 (50.31) B
Gentamicin0000
Kanamycin19 (11.38) A28 (16.97) A153 (76.12) B50 (31.06) C
Clindamycin2 (1.20) A9 (5.45) A129 (64.18) B5 (3.11) A
Erythromycin0 A15 (9.09) B160 (79.60) C5 (3.11) D
Ciprofloxacin76 (45.51) A0 B136 (67.66) C3 (1.86) B
Norfloxacin77 (46.11) A0 B134 (66.67) C3 (1.86) B
Nalidixic acid77 (46.11) A0 B135 (67.16) C3 (1.86) B
  • a Antimicrobial resistance rates of Campylobacter isolates from different poultry production systems are compared by a chi-square test with Yates' correction for continuity. Numbers in the same row with different letters are significantly different (P < 0.05), while numbers with the same letters do not differ significantly.