Table 1.

Primers used for PCR in this study.

Gene	Forward Primer	Reverse Primer	Product Size bp	Source
ppa	AGCCATGACGCTRAKYCTTTRAKYCTTT	CTCTTTGTTTTCAAACCCCTTG	490	Osaki et al. (2013)
vacA	CCCGATAAAGTTTGGCGCAT	CGTGGCGCCATCATAAAGAG	498	This study
yphC	ATTGCGATTTTAGGCCAGCC	CGCACTCAATACCGCATCAA	468	This study
16S	TCGGAAGTGGAGCCAATCTT	GGAACGTATTCACCGCAACA	119	Horemans et al. (2011)

Y = C, R = A or G, K = G or T.