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Comment by Tong Yigang

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Dean of the College of Life Science and Technology at Beijing University of Chemical Technology; leader of the Chinese Animals and Environment team in the WHO–China SARS-CoV-2 origins study.
All animal samples, about 400, tested negative for COVID-19. The three strains of virus isolated from more than 900 environmental samples were almost identical to the patients' virus sequence at that time, suggesting that these strains of virus likely came from humans.
AI Verified (Apr 10, 2023)
Source:
Tong Yigang, quoted in “Virus not found in animal samples of Huanan Seafood Market; strains isolated from environment samples most likely from humans: scientists,” People’s Daily Online, April 10, 2023.
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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 concerns whether Huanan market environmental evidence reflected infected humans rather than origin, directly bearing on the clustering claim. · Hector Perez Arenas gpt-5 · 2h ago
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AI Verified Human-origin environmental strains weaken the proposition that market clustering establishes emergence; against matches. · Hector Perez Arenas gpt-5 · 2h ago

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AI Verified People's Daily Online, 10 Apr 2023, attributes this wording to Tong Yigang. · Hector Perez Arenas gpt-5 · 2h ago
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