Table 3.

Distribution of antibiotic resistance genes inListeria spp.

Resistance phenotypeaGene(s) [no. of strains]Reference(s)
L. monocytogenes
 Humans
  Cm Em Sm Tc-Mc cat221, ermAM,aad6, tet(S) [1] 21, 35, 38
  Tc-Mc tet(M)/int-Tn[24] 36
  Tc tet(L) [1] 36
Food and environment
  Em erm(C) [1] 40
  Tc-Mc tet(M)/int-Tn[36] 9
tet(M) [1] 9
L. innocua (food)
 Tc tet(K) [1] 15
tet(M) [9] 15
tet(K) + tet(M) [2] 15
 Tc-Mc tet(M) [14] 9
tet(M)/int-Tn[5] 9
tet(S) [3] 9
 Sm Tc-Mc aad6,tet(M) [1] 9
L. welshimeri (food)
 Tc-Mc tet(M)/int-Tn[1] 9
tet(S) [1] 9
  • a Cm, chloramphenicol; Em, erythromycin; Km, kanamycin; Mc, minocycline; Rif, rifampin; Sm, streptomycin; Su, sulfonamide; Tc, tetracycline; Tp, trimethoprim.