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Table 1 Antimicrobial resistance and virulence pheno and genotype distribution in conventional and free-range broiler enterococci and in the genomic clusters

From: Resistance and virulence distribution in enterococci isolated from broilers reared in two farming systems

   Conventional (n = 18)
(%)
Free-range (n = 16)
(%)
P value E. faecium cluster A
(n = 10)
(%)
E. faecium cluster B
(n = 11)
(%)
E. faecalis
cluster
(n = 10)
(%)
p value
Antimicrobial resistance
Phenotype TE 14 (77.7%) 14 (87.5%) N.S. 6 (60%) 10 (90.9%) 9 (90%) N.S
E 10 (55.6%) 6 (37.5%) N.S. 3 (30%) 8 (72.7%) 5 (50%) N.S.
CN 9 (50%) 7 (43.8%) N.S. 4 (40%) 5 (45.5%) 7 (70%) N.S.
P 6 (33.3%) 1 (6.25%) N.S. 6 (60%) 0 1 (10%) 0.002
VAN 0 0 0 0 0
Genotype tet(M) 9 (50%) 9 (56.25%) N.S. 3 (30%) 5 (45.5%) 7 (70%) N.S.
erm(B) 8 (44.4%) 4 (25%) N.S. 2 (20%) 5 (45.5%) 4 (40%) N.S.
aac(6′)-Ie-aph(2″)-Ia 5 (27.7%) 1 (6.25%) N.S. 1 (10%) 2 (18.2%) 3 (30%) N.S.
pbp5 6 (33.3%) 1 (6.25%) N.S. 6 (60%) 0 1 (10%) 0.002
Virulence
Phenotype Hemolytic activity 6 (33.3%) 3 (18.75%) N.S. 6 (60%) 1 (9.1%) 0 0.004
Gelatinase activity 8 (44.4%) 9 (56.25%) N.S. 1 (10%) 9 (81.8%) 6 (60%) 0.003
Genotype cylA 0 0 0 0 0
gelE 15 (83.3%) 13 (81.25%) N.S. 7 (70%) 10 (90.9%) 10 (100%) N.S.
esp 0 1 (6.25%) N.S. 0 1 (9.1%) 0 N.S.
agg 0 1 (6.25%) N.S. 0 1 (9.1%) 0 N.S.
  1. Abbreviations: TE tetracycline, E erythromycin, CN gentamicin, P penicillin, VAN vancomycin, tet(M) tetracycline resistance gene, erm(B) macrolide resistance gene, aac (6′)-Ie-aph (2″)-Ia aminoglycoside resistance gene, pbp5 penicillin resistance gene, cylA cytolisin A gene, gelE gelatinase E gene, esp enterococcal surface protein gene, agg aggregation substance gene, N.S. non-significant