The ABO, Lewis of P blood group phenotypes are not associated with recurrent pelvic inflammatory disease

An assumption that ABO, Lewis, or P blood group phenotypes are associated with recurrent pelvic inflammatory disease (PID) in a similar way as with recurrent urinary tract infection has been tried to establish. Of 20 patients with PID 9 (45%) had blood type A, 6 (30%) type B, 1 (5%) type AB and 4 (20%) type O; 14 (70%) had Le(a^-b⁺), 5 (25%) had Le(a⁺b^-), and 1 (5%) had Le(a^-b^-). Of the 20 controls 10 (50%) had blood type A, 3 (15%) type B, 1 (5%) type AB and 6 (30%) type O; 12 (60%) had Le(a^-b⁺), 4 (20%) had Le(a⁺b^-), and 4 (20 %) had Le(a^-b^-). The difference in the proportions of the A, B, AB, and O phenotypes as well as the proportion of combined recessive and nonsecretor phenotype Le(a⁺/^-b^-) between patients with recurrent PID and controls was not statistically significant. The distribution was consistent with that in the general population. 2 of the patient group (10%) and 6 (30%) of the controls had positive blood type P₁ (Fisher's exact probability = 0.0958). The distribution of P₁ between the patients and controls was opposite to that in the general population. We could not demonstrate association of ABO, Lewis or P blood groop phenotypes with recurrent PID.