MBL2 and COVID-19: Those results are also visible within different MBL2 genotype groups, suggesting that COVID-19 patients with MBL high (YA/YA) and MBL intermediate (YA/XA+XA/XA) MBL2 genotypes can increase MBL levels upon infection, while that is not possible for MBL low and deficient genotypes (YA/0 and XA/0+0/0).