[26], [27] (See Supplement Text S1 and Table S3). We saw no significant difference in blood type distribution between mild and severe patients by Fisher exact test. (p = 0.446). (Table 1) We also saw no significant associations when ABO allele distribution was analyzed in the following subgroups: males and females, patients with and without asthma, and patients with and without history of meconium ileus. Here, ABO is linked to intestinal obstruction in the newborn due to guanylate cyclase 2C deficiency.