Comparison of Antibiotic Resistance and Virulence Factors among Escherichia coli Isolated from Conventional and Free-Range Poultry

Table 2

Characteristics of β-lactamase genes and phenotypic antimicrobial resistance profile of strains of ESBL/AmpC-producing E. coli.

Isolate number	Phenotypic resistance profile	β-lactamase genes
1	Amp, amc, cfz, ctx, tet, nal	Group 1 CTX-M
2	Amp, kz, ctx, cn, tet, nal	Group 2 CTX-M
3	Amp, kz, ctx, cn, tet, nal, cip, nor, enr, sut	Group 2 CTX-M
4	Amp, kz, ctx, cn, tet, nal, cip, sut	Group 2 CTX-M
5	Amp, kz, ctx, cn, tet, nal, cip, enr	Group 2 CTX-M
6	Amp, kz, ctx, cn, tet, nal	Group 2 CTX-M
7	Amp, kz, ctx, clo, cn, nal, sut	Group 2 CTX-M
8	Amp, kz, ctx, tet, nal, cip, nor, enr, sut	Group 2 CTX-M
9	Amp, kz, ctx, tet, nal, cip, nor, enr, sut	Group 2 CTX-M
10	Amp, kz, ctx, clo, tet, nal	Group 2 CTX-M
11	Amp, kz, ctx, cn, tet, nal, cip, enr, sut	Group 2 CTX-M
12	Amp, kz, ctx, cn, tet, nal, enr	Group 2 CTX-M
13	Amp, kz, ctx, cn, tet, nal	Group 2 CTX-M
14	Amp, kz, ctx, cn, tet, nal, cip, sut	Group 2 CTX-M
15	Amp, amc, kz, cn, tet, nal, sut	Group 2 CTX-M
16	Amp, amc, kz, ctx, cn, tet, nal	Group 2 CTX-M
17	Amp, amc, kz, ctx, cn, tet, nal, cip, nor, enr, sut	Group 2 CTX-M
18	Amp, kz, ctx, cn, tet, nal	Group 2 CTX-M
19	Amp, kz, ctx, cn, tet, nal	Group 2 CTX-M
20	Amp, kz, ctx, clo, tet, nal, cip, nor, sut	Group 2 CTX-M
21	Amp, kz, ctx, cn, tet, nal, cip, enr	Group 2 CTX-M
22	Amp, amc, kz, ctx, tet, nit, nal	Group 2 CTX-M
23	Amp, amc, kz, ctx, cn, tet	Group 2 CTX-M
24	Amp, amc, kz, ctx, clo, tet, nit, nal, cip, nor, enr, sut	Group 8 CTX-M
25	Amp, kz, ctx, tet, enr	Group 8 CTX-M
26	Amp, kz, ctx, tet, nit	Group 8 CTX-M
27	Amp, amc, kz, ctx, clo, tet, nal, sut	Group 8 CTX-M
28	Amp, kz, ctx, tet	Group 8 CTX-M
29	Amp, kz, ctx, tet, nal, cip, nor, enr	Group 8 CTX-M
30	Amp, kz, ctx, tet	Group 8 CTX-M
31	Amp, kz, ctx, clo, tet, nal, cip, nor, enr	Group 8 CTX-M
32	Amp, kz, ctx, tet	Group 8 CTX-M
33	Amp, kz, ctx, caz, tet	Group 8 CTX-M
34	Amp, kz, ctx, tet, nit	Group 8 CTX-M
35	Amp, kz, ctx, tet, nal, cip, nor, enr	SHV
36	Amp, amc, kz, clo, cn, tet, nit, sut	CIT
37	Amp, amc, kz, cfo, tet, nal, sut	CIT
38	Amp, amc, kz, cfo, cn, tet, nal, sut	CIT
39	Amp, amc, kz, cfo, caz, tet, nal, sut	CIT
40	Amp, amc, kz, cfo, tet, nal, sut	CIT
41	Amp, amc, kz, cfo, caz, tet, nal, cip, nor, enr, sut	CIT
42	Amp, amc, kz, cfo, tet, nal, sut	CIT
43	Amp, amc, kz, cfo, clo, cn, tet, nal, cip, nor, enr, sut	CIT
44	Amp, amc, kz, cfo, ctx, tet, nal, sut	CIT
45	Amp, amc, kz, cfo, caz, tet, nal, cip, enr, sut	CIT
46	Amp, amc, kz, cfo, caz, tet, nit, nal, cip, enr	CIT
47	Amp, amc, kz, ctx, caz, clo, tet, nal, cip, nor, enr, sut	Group 1 CTX-M, Group 2 CTX-M
48	Amp, kz, ctx, tet, nal, cip, nor, enr, sut	Group 2 CTX-M, Group 8 CTX-M
49	Amp, amc, kz, ctx, tet, nal	Group 8 CTX-M, SHV
50	Amp, amc, kz, tet, nal	Group 8 CTX-M, SHV
51	Amp, amc, kz, ctx, clo, tet, nal, cip, nor, enr, sut	Group 2 CTX-M, Group 8 CTX-M, SHV

Ampicillin (AMP); amoxicillin-clavulanic acid (AMC); cefazolin (KZ); ceftazidime (CAZ); cefotaxime (CTX); chloramphenicol (CLO); gentamicin (CN); tetracycline (TET); nitrofurantoin (NIT); nalidixic acid (NAL); ciprofloxacin (CIP); norfloxacin (NOR); enrofloxacin (ENR); trimethoprim-sulfamethoxazole (SUT); not found (NF).