EpiStack

O-7 - 55% of pre-January-2020 cases were Huanan-market-linked versus 8.6% of later cases

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Properties7
type
observation
id
O-7
statement
Among the first 425 confirmed Wuhan cases, 55% of those with symptom onset before 1 January 2020 were linked to the Huanan Seafood Wholesale Market, versus only 8.6% of cases with onset on or after 1 January 2020.
link_state
linked
source
S-13 - Li et al. 2020 NEJM — early transmission dynamics, first 425 confirmed cases
locator
Abstract; Results, exposure history
quote
The majority of cases (55%) with onset before January 1, 2020, were linked to the Huanan...Seafood Wholesale Market, as compared with 8.6% of the subsequent cases.

The declining market-linkage fraction over calendar time is the paper’s key exposure statistic. It is a genuine feature of the line-list, but the exposure ascertainment actively sought market links and the early curve is under-ascertained (see the ascertainment argument on this observation).

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