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

Table 1

Prevalence of phylogenetic group and virulence genes in strains of E. coli isolated by free-range and conventionally raised poultry carcass.

	Free-range ()	Conventional ()
	Number of isolates (%)	Number of isolates (%)
Phylogenetic group
A	19 (54.3)	35 (28.9)
B1	09 (25.7)	45 (37.2)
B2	00 (0)	5 (4.1)
D	07 (20)	36 (29.7)
Virulence genes
hlyF	09 (25.7)	57 (47.1)
iutA	06 (17.1)	66 (54.5)
iss	07 (20)	43 (35.5)
ompT	08 (22.9)	64 (52.9)
iroN	01 (2.9)	35 (28.9)

, Chi-square. Free-range versus conventionally raised poultry carcass E. coli isolates.