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The New York Times

How the Virus Got Out

March 22, 2020 | Science

Many of the first known cases clustered around a seafood market in Wuhan, China, a city of 11 million and a transportation hub.

Four cases grew to dozens by the end of December. Doctors knew only that the sick people had viral pneumonia that did not respond to the usual treatments.

The true size of the outbreak was much larger even then — an invisible network of nearly 1,000 cases, or perhaps several times more.

 

Estimates from Trevor Bedford, Hutchinson Center and University of Washington, and Lauren Gardner, Johns Hopkins University
Originals