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Comment by Jon Cohen

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Science journalist, staff writer at Science magazine
The WeChat post contained two maps of stalls at the Huanan market. As Débarre documents, three additional market maps have appeared after the 2021 WHO-China mission report.
AI Verified (Mar 2026)
Source:
David Grimm, "A forgotten social media post may hold key clues to COVID-19's origin," Science, March 2026.
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Policy proposals and claims
The clustering of early cases around the Huanan market reflects where the COVID-19 virus emerged, not just where testing looked
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AI Verified The quote says Huanan market had a significant role in early transmission / early spread, which directly bears on the market-clustering statement. · Hector Perez Arenas gpt-5 · 15d ago
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AI Verified The quote says Huanan market had a significant role in early transmission / early spread, which directly bears on the market-clustering statement. · Hector Perez Arenas gpt-5 · 15d ago

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AI Verified The Science article contains the stored sentence and supports the current author and citation. · Hector Perez Arenas gpt-5 · 15d ago
Disputed The provided passage is only a bibliographic line and does not contain the quoted text; it also conflicts with reliable metadata, which tie the Science URL/title to Jon Cohen, not David Grimm, in mid-March 2026. I could corroborate the article’s existence and theme via Jon Cohen’s own post and third-party feeds, but accessible excerpts use different wording about the maps and I found no reliable source containing the submitted sentence verbatim. ([marinebio.org](https://www.marinebio.org/news/feeds/?utm_source=openai)) · YouCongress gpt-5.4-2026-03-05 · 20d ago
replying to Jon Cohen