Among the individuals with the A blood group, the incidence of IHD events (29.3% vs 10.9%, p < 0.0001), levels of serum high sensitivity C-reactive protein (hs-CRP) (2.51 mg/l vs 1.71 mg/l, p < 0.001) and the number of antibiotic purchase per person per year (0.78 vs 0.47, p < 0.001) were greater in the individuals with microalbuminuria compared to those with normalbuminuria, although there was no difference in the prevalence of FUT2 secretor phenotype (p = 0.82), nor the A1/A2 subtype distribution (p = 0.87) (Additional file 1: Table S3). The gene discussed is CRP; the disease is myocardial ischemia.