Table 1.

Primers used in the present study.

Gene target	Primer name	Primer sequence (5′-3′)	Amplicon size (bp)	Reference
16S rDNA	CIDIF-F	CTTGAATATCAAAGGTGAGCCA	1085	Kikuchi et al. (2002)
	CIDIF-R	CTACAATCCGAACTGAGAGTA
tcdA	tcdA-F3345	GCATGATAAGGCAACTTCAGTGGTA	629	Persson et al. (2008)
	tcdA-R3969	AGTTCCTCCTGCTCCATCAAATG
tcdB	tcdB-F5670	CCAAARTGGAGTGTTACAAACAGGTG	410	Persson et al. (2008)
	tcdB-R6079A	GCATTTCTCCATTCTCAGCAAAGTA
	tcdB-R6079B	GCATTTCTCCGTTTTCAGCAAAGTA
cdtA	cdtA-F739A	GGGAAGCACTATATTAAAGCAGAAGC	221	Persson et al. (2008)
	cdtA-F739B	GGGAAACATTATATTAAAGCAGAAGC
	cdtA-R958	CTGGGTTAGGATTATTTACTGGACCA
cdtB	cdtB-F617	TTGACCCAAAGTTGATGTCTGATTG	262	Persson et al. (2008)
	cdtB-R878	CGGATCTCTTGCTTCAGTCTTTATAG
tcdA 3′-end deletions	NK9	CCACCAGCTGCAGCCATA	2355a	Kato et al. (1999)
	NKV011	TTTTGATCCTATAGAATCTAACTTAGTAAC

^aAmplicon size when no deletion was present.