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Genetic diversity and distribution of SARS-CoV-2 AY.57 lineage during large nationwide outbreak of COVID-19, Vietnam, 2021. A) Bayesian skyride plot illustrating the relative genetic diversity of AY.57 lineage in Vietnam during 2021. Purple shading indicates 95% highest posterior density interval. B) Distribution of the number of AY.57 sequences used for analysis over the study period.
