Characterization of Integrons and Antimicrobial Resistance in Escherichia coli Sequence Type 131 Isolates

Table 2

Size, number, and gene cassetes amplified from the variable region of integron in E.coli ST131.

Approximate length (kb)	Isolate (n)	Gene cassette (s)
0.15^1	2	—
1.6	4	dfrA17-aadA5
1.6 + 0.7^2	12	dfrA17-aadA5
3.0	1	aac (6′)-Ib-cr-cmlA5
Total	19

¹The 0.15 kb amplicon was found to be a integron variable region without any gene cassette present but contained partial sequences of 5′ and 3′ conserved segments of integrons. ²The 0.7 kb amplicon was found to be a integron variable region without any gene cassette present.