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Table 4 Number of resistant Lactobacillus strains determined on the basis of MIC breakpoints established for the antibiotics

From: Assessment of antibiotic susceptibility in Lactobacillus isolates from chickens

  Number of strains
Do not showing any resistance Susceptible to one drug only With multidrug resistancea Displayed resistance against
Ampicillin (MIC ≥2 or 4 or 8 μg/ml) Tetracyclines (MIC ≥8 or 16 or 32 μg/ml) Macrolides (MIC ≥2 μg/ml) Lincomycin (MIC ≥16 μg/ml) Streptomycin (MIC ≥32 or 128 μg/ml) Gentamicin (MIC ≥16 or 32 μg/ml) Chloramphenicol (MIC ≥8 μg/ml) Tiamulin (MIC ≥8 μg/ml) Enrofloxacin (MIC ≥64 μg/ml) Macrolides and lincomycin Streptomycin and gentamicin
L. salivarius (n = 31) 0 (0%) 2 (6%) 27 (87%) 4 (13%) 23 (74%) 18 (58%) 22 (71%) 16 (52%) 6 (19%) 16 (52%) 29 (93.5%) 18 (58%) 18 (58%) 4 (13%)
L. agilis (n = 3) 0 (0%) 2 (67%) 1 (33%) 0 (0%) 1 (33%) 0 (0%) 1 (33%) 1 (33%) 1 (33%) 0 (0%) 2 (67%) 1 (33%) 0 (0%) 1 (33%)
L. johnsoni (n = 21) 0 (0%) 3 (14%) 16 (76%) 6 (28%) 14 (67%) 10 (48%) 14 (67%) 3 (14%) 0 (0%) 2 (9.5%) 21 (100%) 10 (48%) 10 (48%) 0 (0%)
L. crispatus (n = 12) 0 (0%) 0 (0%) 10 (83%) 8 (67%) 9 (75%) 3 (25%) 8 (67%) 2 (17%) 2 (17%) 1 (8%) 12 (100%) 11 (92%) 3 (25%) 1 (8.3%)
L. reuteri (n = 10) 0 (0%) 0 (0%) 9 (90%) 5 (50%) 9 (90%) 4 (40%) 10 (100%) 2 (20%) 0 (0%) 1 (10%) 7 (70%) 1 (10%) 4 (40%) 0 (0%)
L. ingluviei (n = 8) 2 (25%) 0 (0%) 5 (62.5%) 0 (0%) 7 (87%) 1 (12%) 5 (62%) 0 (0%) 0 (0%) 0 (0%) 5 (62.5%) 0 (0%) 1 (12%) 0 (0%)
L. saerimneri (n = 3) 0 (0%) 0 (0%) 2 (67%) 0 (0%) 2 (67%) 1 (33%) 2 (67%) 3 (100%) 2 (67%) 0 (0%) 3 (100%) 1 (33%) 1 (33%) 2 (67%)
Total: 88 2 (2%) 7 (8%) 70 (79.5%) 23 (26%) 65 (74%) 37 (42%) 62 (70%) 27 (31%) 11 (12.5%) 20 (23%) 79 (90%) 42 (48%) 37 (42%) 8 (9%)
  1. aResistant to at least 3 groups of antimicrobial agents