First epicenter of Covid, Wuhan. Confirmation in an international survey – Corriere.it

from Laura Gappini

By combining them with positive samples taken from the environment, the researchers reconstructed the early stages of virus transmission and the distribution of diseases susceptible to Sars-CoV-2 in humans and mammals.

The covid epidemic appeared in the Wuhan market. New confirmation is coming from An international study published in Science
, which seems to put an end to the diatribe about the origins of the virus’ spread. The researchers reconstructed the early stages of the story, focusing on the spread of disease in humans and mammals susceptible to Sars-CoV-2, linking them to positive samples taken from environments such as cages. All reconstructions lead back to Wuhan’s Huanan Seafood Wholesale Market. ‘Although there is insufficient evidence to define upstream events and the exact circumstances are unclear, our analyzes indicate that the virus spread from the live wildlife trade in China and show that the Huanan market was the epicenter of the outbreak. teachers.

First foci of pneumonia

The world only became aware of what was happening on December 31, 2019, when the Chinese government notified the World Health Organization of an outbreak of severe pneumonia of unknown etiology in Wuhan, a city of about 11 million people. Of the 41 people initially hospitalized with pneumonia, 27 attended the Huanan market. Between 18 and 29 December 2019 the first diagnoses of Covid were made in several hospitals. A systematic review of all cases reported by Wuhan hospitals as part of a WHO-China joint study found 55 of the 168 first known cases. Corresponding to the covid market. However, even today, the debate over the origin of the virus divides the scientific community There is no shortage of experts who believe that SARS-CoV-2 was born in a laboratory.

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Transition from animal to man

A second study published in the same journal Instead, he went back to the first two lineages of the virus and reconstructed the SARS-CoV-2 family tree. The researchers determined that the virus may have first spread from animals to humans Between 23 October and 8 December 2019. “These results indicate that Sars-CoV-2 was unlikely to have spread widely among humans before November 2019 and define a narrow window between when the virus first traveled to humans and when the first cases were reported.

July 26, 2022 (July 26, 2022 Change | 20:54)

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