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

Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China

Chaolin Huang; Yeming Wang; Xingwang Li; and 26 others; Bin Cao; The Lancet · 2020

AI-verified citationSRC-HUANG-2020

identifier / locator: The Lancet 395(10223):497–506; PMID 31986264; PMC7159299; online 24 January 2020
url: https://pmc.ncbi.nlm.nih.gov/articles/PMC7159299/
verification note: Open-access full text fetched 2026-08-26 from the repository deposit; the patient counts, the market exposure proportion, the first onset date, and the no-epidemiological-link sentence all quoted verbatim. No erratum attaches to the record. The publisher DOI is 10.1016/S0140-6736(20)30183-5 and resolves; it is recorded here in prose rather than as the primary locator because its embedded parentheses are truncated by automated identifier checkers, and the open repository copy is both stable and readable.
reliability notes: The earliest published clinical series, and correspondingly early: it describes 41 confirmed patients identified by 2 January 2020, not a complete outbreak reconstruction.
Carries evidence in both directions — two-thirds of patients had direct market exposure, and the earliest case by onset had none.
Whether the patient it identifies as earliest really was, and whether the reported onset date is right, have been disputed in later reporting this case has not adjudicated; the claim built on it is framed as what the publication states.

Evidence drawn from this source

Undermines· moderateCOV-E003

what the source states: "By Jan 2, 2020, 41 admitted hospital patients had been identified as having laboratory-confirmed 2019-nCoV infection. … 27 (66%) of 41 patients had been exposed to Huanan seafood market." And: "The symptom onset date of the first patient identified was Dec 1, 2019. None of his family members developed fever or any respiratory symptoms. No epidemiological link was found between the first patient and later cases."
what we infer: The same paper carries evidence in both directions, which is why it is recorded once rather than split into a favorable half. Two-thirds of the earliest confirmed patients had direct market exposure — strong for the market's centrality — while the earliest case by onset had none, which is what an upstream or non-market index event predicts.
limitations: A single case's reported exposure history in an early clinical series is weak evidence about the outbreak's origin.
The identification of this patient as the earliest case, and the December 1 onset date, have been disputed in later reporting this case has not adjudicated.