The best part about the article is so many references.
> (Zhou et al., 2020; Wrapp et al., 2020; Wan et al., 2020; Walls et al., 2020; Letko et al., 2020).
https://doi.org/10.1038/s41586-020-2012-7
https://doi.org/10.1126/science.abb2507
https://doi.org/10.1128/JVI.00127-20