Table 1.

Primers used for sequencing beta-lactamase genes from Escherichia coli isolates and their transconjugants

Target	Primer name	Oligonucleotide sequence (5′–3′)		Product size (bp)	Reference
		Forward	Reverse
blaCTX–M group A1	CTX–M–1 upstream	ATGTTGTTGTTAATTCGTCTC	CGTTATCGCTGTACTGTAG	446	52
	CTX–M–1 downstream	TTAACTATAATCCGATTGCG	TTTCTGCCTTAGGTTGAG	507	52
blaCTX–M group 9	CTX–M–4 upstream	ATTCCGCTGCTGCTGGGCAG	GCGGCGTGGTGGTGTCTCTC	511	This study
	CTX–M–4 downstream	CGGGAGGCGTGACGGCTTTT	TTGCCACGGAACGGTCTGCG	520	This study
blaCMY–2	AmpC	ATGATGAAAAAATCGTTATGC	TTGCAGCTTTTCAAGAATGCGC	1,143	25
blaTEM	TEM	ATAAAATTCTTGAAGACGAAA	GACAGTTACCAATGCTTAATCA	1,074	29