ats, pangolins, weasels, cats, and other species all could be potential natural hosts.
The virus was found in environmental tests at the Huanan seafood market after its closure, especially in its aquatic product stalls. The coronavirus at the market might have been introduced through channels such as infected people, contaminated cold chain products, and animal products, but it is still uncertain.
No positive results occurred in large-scale testing of animal products in the market; no novel coronavirus was found either in samples of bats in Hubei province or large numbers of livestock, poultry, and wild animals across China; no evidence was found that the novel coronavirus was transmitted among livestock, poultry, and wild animals before and after the outbreak.
In December 2019, the novel coronavirus spread among people on a certain scale in Wuhan, with most cases occurring in the second half of the month.
The Huanan seafood market was an epicenter of the disease and attracted high attention from the disease control and prevention department in the early stage of the epidemic. However, a study on the early COVID-19 cases showed that when cases occurred at the market, other parts of Wuhan also saw cases at the same time.
The experts identified four hypotheses for the source of the transmission of the novel coronavirus to the human population, including direct zoonotic spillover, the cold-chain food, an intermediary host species, and a laboratory-related incident.
The joint study said that a laboratory incident is “extremely unlikely” as the cause of COVID-19.
It said introduction through an intermediary host species is “the most likely” passway. Direct transmission or introduction through cold-chain food is also likely.
The joint expert team also offered suggestions on future global study on COVID-19 origins.
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