Table 1.

Primers and PCR conditions.

Gene	Primers (forward, reverse)	Annealing temperature (°C)	Amplified product length (bp)
cagA	5′-GATAACAGGCAAGCTTTTGAGG-3′	57	349
	5′-CTGCAAAAGATTGTTTGGCAGA-3′
vacAs1	5′-ATGGAAATACAACAAACACAC-3′	52	259
	5′-CTGCTTGAATGCGCCAAAC-3′
vacAm1	5′-CAATCTGTCCAATCAAGCGAG-3′	56	570
	5′-GCGTCTAAATAATTCCAAGG-3′