Figure 1.

Genetic diversity of noroviruses within a pediatric cohort in Dhaka, Bangladesh. A, Evolutionary relationships between GII noroviruses (252 nucleotide region of the 5ʹ-end of the VP1 gene) collected from children in Dhaka, with reference sequences representing genotypes observed globally included as background, inferred using maximum likelihood methods. Clades of viruses with the same genotype are represented by triangles, which are shaded according to the immunotypes A–L defined by Parra et al [10]. Bootstrap values are provided for nodes, and branch lengths are drawn to scale. The 18 GII genotypes identified in the Dhaka birth cohort are indicated with black circles with green outline. B, Each solid circle represents a norovirus sample from a child in this study. The date of collection is represented on the x-axis. Samples are ordered on the y-axis by genotype and immunotype.