Among low producers of MBL, we observed an estimated odds ratio of 7.1 (95% confidence interval [CI] 1.6–32.1) for invasive methicillin-resistant Staphylococcus aureus (MRSA) co-infection compared with case-patients with high or intermediate MBL production, according to MBL2 genotype (p = 0.02 by Fisher exact test; Table 3). Here, MBL2 is linked to coinfection.