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Demographic expansion of SARS-CoV-2 XBB.1.5. Bayesian Skyline Plot (A) and lineages through times (B) of SARS-CoV-2 XBB.1.5 variant. The viral effective population size (y-axis) is shown as a function of days (x-axis). The solid area represents the 95% high posterior density (HPD) region.
