Antigenic distance at different levels of classification.

<p>(A) Distribution of antigenic distance in each level of classification, with serotype in green, genotype in purple and major lineage in yellow. Minor lineage is excluded due to a lack of antigenic data across minor lineages. (B) 3D map of sequences in antigenic space by serotype, colored by genotype. (C) 3D map of sequences in antigenic space by serotype, colored by major lineage</p> <p>(PDF)</p>