TABLE I. Distribution of the Helicobacter pylori vacA signal (s) and middle (m)a alleles and cagA status according to the vacA intermediate (i) genotypes.

	n (%)					cagA status
	s1	s2	m1	m2		Positive	Negative
vacA i1	30 (90.9)	0	14 (100)	5 (35.7)		27 (90)	2 (22.2)
vacA i2	3 (9.1)	6 (100)	0 (0)	9 (64.3)		3 (10)	7 (77.8)
p	< 0.001		< 0.001			< 0.001

a: amplified in 29 samples; n = 40 (1 sample with a mixed genotype was not included in the analyses).