O-18 - SARS-CoV-2-positive environmental samples were concentrated in the market's western (wildlife) wing
The positive swabs are not uniformly distributed across the market but cluster in the western/wildlife section, the stalls where live mammals were sold.
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Why this is evidence
H-14 (wildlife spillover) predicts positives concentrate in the wildlife wing; H-15 (human-seeded) predicts contamination tracks human traffic across the market. West-wing concentration favors H-14 over H-15.