TABLE 1.

Nucleotide sequences of primers used to detect the cagA gene^a

Primer	Sequence (5′ to 3′)	Location
A1	GATAACAGGCAAGCTTTTGAGGGA	157–181
A2	CCATGAATTTTTGATCCGTTC	550–527
A3	ATGGGGAGTCATGATGGCATAGAACC	910–935
A4	ATTAGGCAAATTAAAGACAGCCACC	1626–1602

^aThe indicated primers were used in PCRs consisting of 40 cycles as follows: 1 min at 94°C, 1 min at 58°C, and 1 min at 72°C.