TABLE 3.
Antimicrobial susceptibility and resistance genes of mcr-2-positive E. coli isolates from pigs.
| Strain | Phenotypic resistance | Antimicrobial resistance genes according to antibiotic classes* |
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| BL | AMG | FQ | PMB | TET | FOL | PHE | ML | LIN | ||
| IHIT31008 | AMP, PIP, TET, CHL, SXT, PMB, CST | bla TEM–1B | aadA1, aadA10, aph(6)-Id, aph(3“)-Ib | – | mcr-2.1 | tet(B) | sul1, dfrA1, dfrA14 | catA1 | mdf(A) | Inu(G) |
| IHIT32395 | AMP, PIP, TET, CHL, SXT, PMB, CST | bla TEM–1B | aadA10, aph(6)-Id, aph(3“)-Ib | – | mcr-2.1 | tet(B) | sul1, dfrA1, dfrA14 | catA1 | mdf(A) | Inu(G) |
| IHIT32396 | AMP, PIP, TET, CHL, SXT, PMB, CST | bla TEM–1B | aadA1, aadA10, aph(6)-Id, aph(3“)-Ib | – | mcr-2.1 | tet(B) | sul1, dfrA1, dfrA14 | catA1 | mdf(A) | Inu(G) |
| IHIT32302 | AMP, PIP, TET, SXT, PMB, CST | bla TEM–1B | aadA1, aadA5, aph(6)-Id, aph(3“)-Ib | GyrA S83L | mcr-2.8 | tet(B) | sul1, dfrA17 | – | mdf(A) | Inu(G) |
| IHIT32399 | AMP, PIP, TET, SXT, PMB, CST | bla TEM–1B | aadA1, aadA5, aph(6)-Id, aph(3“)-Ib | GyrA S83L | mcr-2.8 | tet(B) | sul1, sul2, dfrA17 | – | mdf(A) | Inu(G) |
| IHIT32303 | AMP, PIP, TET, PMB, CST | bla TEM–1B | aadA2 | – | mcr-2.1 | tet(B) | sul1 | – | mdf(A) | – |
| IHIT32397 | AMP, PIP, TET, SXT, PMB, CST | bla TEM–1B | aadA1, aph(6)-Id, aph(3“)-Ib | – | mcr-2.1 | tet(A) | sul1 sul2, dfrA1 | – | mdf(A) | – |
| IHIT32305 | AMP, PIP, GEN, TOB, CHL, SXT, PMB, CST | bla TEM–1C | aadA1, aadA2, aph(4)-Ia, aph(6)-Id, aph(3“)-Ib, aac(3)-IV | GyrA S83L, ParC S80R | mcr-2.1 | sul2, sul3, dfrA12 | cmlA1 | mdf(A) | – | |
| IHIT32304 | AMP, PIP, TET, SXT, PMB, CST | bla TEM–1B | aadA1, aph(6)-Id, aph(3“)-Ib | – | mcr-2.1 | tet(A) | sul1, dfrA1 | – | mdf(A) | – |
| IHIT32403 | AMP, PIP, TET, SXT, PMB, CST | blaTEM–1B, blaOXA–4 | aadA2, ant(2“)Ia, aph(3’)-Ia, aph(3’)-XV | – | mcr-2.1 | tet(A), tet(M) | sul1, sul2, sul3, dfrA1, dfrA12 | cmlA1, catB3 | mdf(A), mph(E), msr(E) | – |
| IHIT32401 | AMP, PIP, TET, SXT, PMB, CST | bla TEM–1A | aadA1, aph(6)-Id, aph(3“)-Ib | – | mcr-2.1 | tet(B) | sul1, sul2, dfrA1 | – | mdf(A), mph(B) | – |
| IHIT32402 | AMP, PIP, TET, SXT, PMB, CST | bla TEM–1B | aadA1, aph(6)-Id, aph(3“)-Ib | – | mcr-2.1 | tet(B) | sul1, sul2, dfrA1 | – | mdf(A), mph(B) | – |
*BL, beta-lactam, AMG, aminoglycoside, FQ, fluoroquinolone, PMB, polymyxin B, TET, tetracycline, FOL, folate pathway antagonist, PHE, phenicol, ML, macrolide, LIN, lincosamide.