Antimicrobial resistance and integron gene cassette arrays in commensal Escherichia coli from human and animal sources in IRI

Table 3 Gene cassette arrays of class I integrons in E. coli from different species

Species/cassette array	No. (%) of the human isolates carrying gene cassette array	No. (%) of the chicken isolates carrying gene cassette array	No. (%) of the sheep isolates carrying gene cassette array	No. (%) of the cattle isolates carrying gene cassette array	Total^a
dfrA1	1 (2)	4 (8)	0 (0)	1 (2)	6
dfrA5	0 (0)	3 (6)	1 (2)	0 (0)	4
dfrA7	1 (2)	2 (4)	0 (0)	0 (0)	3
dfrA12	2 (4)	3 (6)	1 (2)	1 (2)	7
aadA1	3 (6)	10 (20)	4 (8)	1 (2)	18
aadA4	0 (0)	2 (4)	1 (2)	0 (0)	3
dfrA17-aadA1	0 (0)	2 (4)	0 (0)	0 (0)	2
aadA1-aadB	1 (2)	2 (4)	0 (0)	0 (0)	3
dfrA12–orfF–aadA2	0 (0)	2 (4)	1 (2)	0 (0)	3
Total	8 (16)	30 (60)	8 (16)	3 (6)	49

^aThe number of the isolates carrying intI, is 55, however, in six class I integron positive isolates, the cassette arrays could not be detected by PCR

ISSN: 1757-4749