The Origins of SARS-CoV-2 · source record · paper

The Huanan Seafood Wholesale Market in Wuhan was the early epicenter of the COVID-19 pandemic

Michael Worobey; Joshua I. Levy; Lorena Malpica Serrano; Alexander Crits-Christoph; Jonathan E. Pekar; and 13 others; Science · 2022

AI-verified citationSRC-WOROBEY-2022

identifier / locator: Science 377(6609):951–959; DOI 10.1126/science.abp8715; corrected by DOI 10.1126/science.adp1133
url: https://doi.org/10.1126/science.abp8715
verification note: Version of record read via a Wayback snapshot dated 2025-07-07 (the publisher bot-walls automated clients), cross-checked against the open-access First Release deposit; quotations taken from the version of record with section locators.
reliability notes: Peer-reviewed, and not independent of the other market analyses: it shares authors and underlying Chinese CDC case and environmental data with the companion lineage paper and the 2024 metagenomic reanalysis. Treat all three as one evidence stream with three analytic layers.
Rests entirely on Chinese case ascertainment that has never been independently audited; the complete December 2019 line list has never been released.
Its excess-pneumonia and seroprevalence points are citations to other work, not findings of this paper, and are not attributed to it here.
Corrected in March 2024 by an erratum that fixed duplicated data files and a pseudoreplicate count and states all results remained the same.
A published eLetter disputes the spatial result and the authors replied identifying flaws in the critique; the exchange is recorded as the symmetric undermining material rather than suppressed.

Evidence drawn from this source

Supports· strongCOV-E001

Early cases clustered around the market, including cases with no market link

what the source states: "We considered three categories of cases, which were all significantly closer to the Huanan market than expected: (i) all cases (median distance 4.28 km; P < 0.001), (ii) cases linked directly to the Huanan market (median distance 5.74 km; P < 0.001), and (iii) cases with no evidence of a direct link to the Huanan market (median distance 4.00 km; P < 0.001)." And, from the Discussion: "this group of cases resided significantly closer to the market than those who worked there, indicating that they had been exposed to the virus at or near the Huanan market. For market workers, the exposure risk was their place of work, not their residential locations, which were significantly farther afield than those cases not formally linked to the market."
what we infer: This is the observation that ascertainment bias has the hardest time explaining. If early cases were found because investigators looked around the market, the unlinked cases should not be the ones living nearest it. The comparison is significant at p = 0.029, which is a modest margin for a load-bearing result.
limitations: Rests on Chinese case ascertainment that has never been independently audited; the complete December 2019 line list has not been released.
Not independently reproduced; the code and raw geospatial data have not been re-run by a third party.
A published eLetter disputes the spatial result on distributional grounds and the authors replied identifying flaws in that critique; the exchange is unresolved.

Michael Worobey (2022)AI-verified citationCOV-C001 COV-C002