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Table 3 Phenotypic antibiotic resistance and the occurrence of integrons in E. coli isolates

From: Prevalence and molecular characterization of extended-spectrum β–lactamase—producing Escherichia coli isolates from dairy cattle with endometritis in Gansu Province, China

No. of strain

Resistance phenotypesa

Integronsb

Gene cassettesc

1

AMP/TRI/TET/GEN/OXY/ERY

Class1

dfrA1

2

AMP/AMO/CES/TET

Class1

dfrA1

3

AMP/AMO/CES/TRI/GEN/TET/GEN/OXY/ERY/ENR

Class1

aadA5

4

AMP/AMO/CES/CEF/TRI/GEN

Class1

dfrA17-aadA5

5

AMP/AMO/CES/TRI/GEN

Class1

dfrA17-aadA5

6

AMP/AMO/TET/GEN/OXY

Class1

dfr1-aadA1

7

AMP/AMO/GEN//ERY

Class1

dfrA17-aadA5

8

AMP/AMO/CES/TRI/TET/GEN/OXY/ERY

Class1

dfrA17-aadA5, dfrA1

9

AMP/AMO/CES/CEF/TRI/OXY/ERY

Class1

dfrA1

10

AMP/AMO/CES/CEF/TRI/TET/OXY/ERY/STR

Class1

dfrA17-aadA5

11

AMP/CES/CEF/TRI/GEN/OXY/ERY/STR/ENR

Class1

undetected

12

AMP/AMO/CES/CEF/TET/GEN/OXY/STR

Class1

dfrA17-aadA5, aadA1

13

AMP/AMO/CES/CEF/TRI/TET/GEN/STR

Class1

dfrA17- aadA5

14

AMP/AMO/CES/CEF/TRI/GEN/ERY

Class1

aadA1

15

AMP/AMO/CES/CEF/TRI/GEN/OXY

Class1

dfrA17-aadA5

16

AMP/AMO/TRI/TET/GEN/STR/ENR

Class1

dfrA1

17

AMP/TRI/TET/GEN/OXY/ERY/ENR

Class1

undetected

18

AMP/AMO/CES/CEF/GEN/OXY/STR

Class1

dfr1-aadA1

19

AMP/AMO/CES/CEF/TET/GEN/OXY/ERY

Class1

dfrA17-aadA5, aadA5

20

AMP/AMO/CES/CEF/TRI/TET/GEN/OXY/ERY

Class1

dfrA17-aadA5

21

AMP/AMO/CES/CEF/TRI/GEN/OXY/ERY/STR

Class1

aadA1, dfrA17-aadA5

22

AMP/AMO/CES/CEF/TRI/TET/GEN/OXY

Class1

undetected

23

AMP/AMO/CES/CEF/TET/GEN/OXY/STR/ENR

Class1

dfrA17-aadA5

24

AMP/AMO/CES/CEF/GEN/OXY/ERY/STR/ENR

Class1

dfrA17-aadA5

  1. AMP Ampicillin, AMO Amoxicillin, CES Ceftiofur, CEF Cefotaxime, TRI Trimethoprim, TET Tetracycline, GEN Gentamicin, OXY Oxytetracycline, FLO Florfenicol, ERY Erythrouycin, MER Meropenem, IMI Imipenem, STR Streptomycin, ENR Enrofloxacin, aadA1 aminoglycoside-3’-adenylytransferase gene, dfrA1 dihydrofolate reductase gene, dfrA17-aadA5 dihydrofolate reductase gene and aminoglycoside-3’-adenylytransferase gene, dfr1-aadA1 dihydrofolate reductase gene and aminoglycoside-3’-adenylytransferase gene
  2. aThe most common multi-drug resistance pattern observed among E. coli isolates
  3. bIntegrons, Class1 integron gene
  4. cKinds of gene cassettes