MBL2 and diphtheria: Antibody geometric mean concentrations (GMC) after booster doses (pre and post) of acellular pertussis vaccine compained with tetanus and diphtheria toxoidsin 355 adolescent subjects with MBL wild type (A/A), heterozygotes variant type A/O (A/B, A/C, A/D) and homozygote variant type O/O (B/B, B/D, D/D, C/D, C/C).