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Phylodynamic analysis of influenza B/Victoria viruses in the United States. (A and B) Relative genetic diversity of HA and NA gene segments estimated using a Bayesian Skyride model with Gaussian Markov random field (GMRF) smoothing. (C and D) Reconstructed temporal phylogenies for HA and NA gene segments, respectively. Tip color on phylogenies denotes subclades (V1A.1 to 3) determined by the HA gene segment.
