l********1
发帖数: 1 | 1 Studies offer further evidence that the coronavirus pandemic began in
animals in Wuhan market
By Katherine Dillinger, CNN
Updated 7:11 PM ET, Sat February 26, 2022
The Origins of Covid-19: Searching for the source
(CNN)Two preprint studies posted Saturday offer further evidence that the
coronavirus originated in animals and spread to humans in late 2019 at the
Huanan Seafood Market in Wuhan, China.
One of the studies -- neither of which has been peer-reviewed or published
in a professional journal -- used spatial analysis to show that the earliest
known Covid-19 cases, diagnosed in December 2019, were centered on the
market. The researchers also report that environmental samples that tested
positive for the virus, SARS-CoV-2, were strongly associated with live-
animal vendors.
The other study says the two major viral lineages were the result of at
least two events in which the virus crossed species into humans. The first
transmission most likely happened in late November or early December 2019,
the researchers say, and the other lineage was probably introduced within
weeks of the first event. |
