O-1 - 74 of 923 Huanan environmental swabs SARS-CoV-2-positive, concentrated in the live-wildlife section
Descriptive metagenomic/qPCR surveillance of the market surfaces. Positives cluster in the live-wildlife-selling section rather than being uniform across the market. One positive carried a lineage-A genome (the lineage otherwise rarer among the earliest human cases).
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Why this is evidence
H-1 predicts contamination to be densest exactly where live susceptible wildlife was sold and slaughtered. H-5 and H-6 predict market contamination only as a downstream human-amplification event, which should track human footfall/stall density rather than the live-wildlife section specifically, and gives no reason for a spatial gradient toward that section.