Table 2.

Distribution of ABO and Lewis blood group phenotypes in relation to serological diagnosis of H pylori infection in ulcer patients and controls

Blood group	H pylori infection
	Patientsa			Controlsb
phenotypes	N	Positive	Negative	N	Positive	Negative
A2 Le(a-b+) ou O Le(a-b+)	27	26	1	30	25	5
A1/AB/B/Le(a-b+) ou O Le(a-b-)	15	12	3	20	5	15
Total	42	38	4	50	30	20

^aP > 0.05 vs bacterial density, lymphocytic and granulocytic infiltration degree;

^bP < 0.01 vs polymorph nuclear activity.