Table 2 Antimicrobial resistance in enterococci isolated from chicken

Antimicrobial agent Resistance (%)a,b
E. faecium(N = 60, %) E. faecalis(N = 37, %) Total(N = 97, %)
Kanamycin 59 (98.33) 37(100) 96 (98.96)
Erythromycin 27 (45.00) 10 (37.02) 37 (38.14)
Gentamicin 1 (1.66) 1 (2.70) 2 (2.06)
Tetracycline 3 (5.00) 6 (16.21) 9 (9.27)
Vancomycin - c - c - c
Nalidixic acid 60(100) 37(100) 97(100)
Streptomycin 1 (1.66) - c 1 (1.03)
Penicillin G 4 (6.66) 4 (10.81) 8 (8.24)
Ampicillin 44 (73.33) 15 (40.54) 59 (60.82)
Chloramphenicol 1 (1.66) 2 (5.40) 3 (3.09)
Rifampicin 49 (81.66) 29 (78.37) 78 (80.41)
Ciprofloxacin 19 (31.66) 14 (37.83) 33 (34.02)
Total
Resistance to 1 antimicrobial - c - c - c
Resistance to 2 antimicrobials - c 2 (5.40) 2 (2.07)
Resistance to 3 antimicrobials 10 (16.67) 8 (21.62) 18 (18.55)
Resistance to 4 antimicrobials 19 (31.66) 13 (35.15) 32 (32.98)
Resistance to 5 antimicrobials 25 (41.67) 9 (24.32) 34 (35.05)
Resistance to ≥6 antimicrobials 6 (10.00) 5 (13.51) 11 (11.35)
a The diameters of the zones were compared with the diameters specified by the Clinic Laboratory Standards Institute (CLSI, 2011).
b Percentage resistance was determined by dividing the number of resistant isolates by the total number of isolates per species.
c No isolates were resistant.