Table 1. Oligonucleotides used in this study.

Isolate	Oligonucleotide	5′- 3′	Application
YI80-1, YI80-4, YI80-5	radA-for	ctsccsggygtbgghccvgcdachgcvgav	amplification and sequencing of the radA gene
	radA-rev	tgsaggtgyttgttgagyttctgctg
YI80-1	standard for	ggagtccgggttggaggcgacctg	standard fragment
	standard rev	gacggcggagaaactcgaagacaacgg
	analysis for	gcttgcgatttcctgggccttctcgg	analysis fragment
	analysis rev	gctctcggtcaacgtccagttaccggcc
YI80-4	standard for	cggggttggaggcgacctggttgg	standard fragment
	standard rev	cggccgaacgtgatcaaacgcgg
	analysis for	ccttcgcgagttcgagggccttctcg	analysis fragment
	analysis rev	ccaggtcacccaccagatggcggtc
YI80-5	standard for	gcttgttgagcttctgctgtcgctcggc	standard fragment
	standard rev	ccgccgacaagctcgtcgacgc
	analysis for	cgtgttccttcgcgagttcgagggc	analysis fragment
	analysis rev	cagatggcggtcaacgtccagctaaccc