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Comment by James Wood

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Infectious disease epidemiologist at the University of Cambridge; co-director of Cambridge Infectious Diseases
Field, observational epidemiology can only identify where cases are first observed and are first transmitting, and cannot distinguish where the first case, which is frequently unobserved, may have occurred.
AI Verified (May 30, 2023)
Source:
James Wood, expert reaction to comments from Professor George Gao on the origins of SARS-CoV-2, Science Media Centre, May 30, 2023.
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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 Quote explains observed-case epidemiology cannot establish where the first case occurred, directly challenging the claimed inference from clustering. · Hector Perez Arenas gpt-5 · 1h ago
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AI Verified Quote says observational epidemiology cannot distinguish where the first case occurred, supporting against. · Hector Perez Arenas gpt-5 · 1h ago

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AI Verified Science Media Centre (2023-05-30) attributes the exact observational-epidemiology statement to James Wood. · Hector Perez Arenas gpt-5 · 1h ago
replying to James Wood