Table 1.

Primers used for PCR

Gene	Primer sequence (5′ to 3′)	Product size	Annealing temp
mexA	F-CCTGCTGGTCGCGATTTCGG	312 bp	64.1
	R-CCAGCAGCTTGTAGCGCTGG
mexB	F-GTGTTCGGCTCGCAGTACTC	224 bp	62.5
	R-AACCGTCGGGATTGACCTTG
mexC	F-TTGGCTATGGCCATCGCGTT	371 bp	60.5
	R-ATCGAAGTCCTGCTGGCTGA
mexD	F-CCCGAAATTCCTTTACGCGAT	146 bp	59.5
	R-CGCATTGGTGAAGTCGTTGA
mexE	F-ATCCCACTTCTCCTGGCGCT	240 bp	62.5
	R-GGTCGCCTTTCTTCACCAGT
mexF	F-AAGTACGCCGACATTCAGGA	131 bp	58.4
	R-TGATGATGTTCTGGGTCTGCT
mexX	F-GCGATGCGGATTGCGGAACA	792 bp	62.5
	R-TGGTCGCCCTATTCCTGCTG