January 1, 2020: Chinese authorities closed the Huanan Seafood Wholesale Market, to which many cases in that early cluster had links.
Researchers think the coronavirus originated in bats, then may have jumped to an intermediary species that passed it to people.
China has since banned the buying, selling, and transportation of wild animals in markets, restaurants, and online marketplaces across the country.
But later research has suggested that the market simply boosted transmission of the coronavirus — it wasn’t the outbreak’s original origin site.
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