Genetic elements associated with antimicrobial resistance among avian pathogenic Escherichia coli

Table 1 Overview and characteristics (MDR strains, integron presence, and antibiotic resistance) of the APEC strains classified per serotype

Serotype	No. of strains	No. of MDR strains^a	No. of different antibiotic resistance profiles	No. isolates carrying integrons
				Class 1	Class 2	Total
O1:H7	14 (12.1%)	6	14	2	0	2 (14.3%)
O2:H6	18 (15.5%)	14	18	6	0	6 (33.3%)
O8	2 (1.7%)	2	2	0	0	0 (0%)
O111:H2	4 (3.4%)	4	4	2	2	4 (100%)
O26:H11	6 (5.2%)	6	6	4	0	4 (66.7%)
O44:H18	2 (1.7%)	2	2	0	0	0 (0%)
O55:H7	10 (8.6%)	8	6	0	0	0 (0%)
O78	32 (27.6%)	28	24	16	0	16 (50.0%)
O119:H6	6 (5.2%)	4	6	0	0	0 (0%)
O124	4 (3.4%)	4	4	0	0	0 (0%)
O126:H2	6 (5.2%)	6	6	0	0	0 (0%)
O127:H6	6 (5.2%)	4	6	0	2	2 (33.3%)
O128:H2	2 (1.7%)	2	2	0	0	0 (0%)
O142:H6	2 (1.7%)	0	2	0	0	0 (0%)
O158	2 (1.7%)	0	2	0	0	0 (0%)
Total	116	90 (77.6%)		30 (25.9%)	4 (3.4%)	34 (29.3%)

^a MDR strains multidrug-resistant strains that exhibited resistance to 3 or more different classes of antimicrobials

ISSN: 1476-0711