This paper has now been published here: https://www.nature.com/articles/s41591-020-0820-9 The published version includes updates and corrections and should be considered the final version (it is also Open Access). Kristian G. Andersen1,2*, Andrew Rambaut3, W. Ian Lipkin4, Edward C. Holmes5 & Robert F. Garry6,7 1Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA
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