MBL2 and atopic eczema: However, when exploring the impact of MBL deficiency on further anamnestic data, we noted that none of the MBL-deficient women (as assessed both by serum MBL <100 ng/ml and MBL2 genotypes associated with low MBL) had a history of atopic eczema or asthma compared to a 20% prevalence in the group with intermediate MBL levels.