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O-6 - Molecular-clock dating places tMRCA in mid-December 2019 and lineage B primary infection around 18 Nov 2019

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observation
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O-6
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BEAST phylodynamic dating of the early genomes estimated the SARS-CoV-2 tMRCA at ~11 December 2019 (95% HPD 25 Nov–12 Dec), the lineage B primary-case infection at ~18 November 2019 (95% HPD 23 October–8 December), and the lineage A primary case at ~25 November 2019 (95% HPD 29 October–14 December).
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S-1 - Pekar et al. 2022 — molecular epidemiology of multiple zoonotic origins of SARS-CoV-2
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Results, molecular dating; Fig. 2
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infection date of the lineage B primary case to be 18 November (95% HPD: 23 October to 8 December)

Dating used recCA rooting (a reconstructed recombinant common ancestor across 15 non-recombinant sarbecovirus regions) as well as unconstrained rooting. Median lineage-B tMRCA 15 Dec, lineage-A tMRCA 20 Dec; lineage B primary case predated lineage A in 64.6% of the posterior, by a median 7 days.

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