Towards Pandemic-Scale Ancestral Recombination Graphs of SARS-CoV-2 Shing H. Zhan1, Anastasia Ignatieva2,3,*, Yan Wong1,*, Katherine Eaton4, Benjamin Jeffery1, Duncan S. Palmer1, Carmen L. Murall4, Sarah P. Otto5, Jerome Kelleher1,† 1Big Data Institute , Li Ka Shing Centre for Health Information and Discovery, University of Oxford, United Kingdom 2Department of Statistics, University of Oxford, United Kingdom 3School of Mathematics and Statistics, University of Glasgow, United Kingdom 4Nati...