O-4 - 47,381 live animals of 38 species sold at Wuhan markets 2017-2019 including SARS-CoV-2-susceptible raccoon dogs at Huanan
Direct observational census collected before the origins debate existed. Establishes that live, susceptible intermediate-host-candidate species were routinely present and slaughtered on-site at Huanan.
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Why this is evidence
H-1 requires a susceptible intermediate host physically present at Huanan; this pre-pandemic census confirms the mechanism was available there. H-5 predicts nothing about the market’s species inventory. H-6 is partly supported too (the same supply chain reaches other venues), so the discrimination is mainly H-1 vs H-5.