MBL2 and dengue disease: To the best of our knowledge, our study is the first report showing an association of MBL2 polymorphisms in the promoter and exon 1 regions including MBL2 genotypes (− 550L/H, MBL2 codon 54), MBL2 diplotypes (XA/XO, YA/XO) and MBL2 haplotypes (LXPB, HXPA, XO) with DENV infection and dengue in Vietnam.