The first case of Covid-19 identified in the city of Wuhan, China, occurred days later than previously believed. Furthermore, the true patient zero is actually connected to an animal market, found a study published in the scientific journal Science.
The first case of the disease is that of a saleswoman who worked in the live animal market in Wuhan – where wild and domestic animals were sold. Virologist Michael Worobey, from the Department of Ecology and Evolutionary Biology at the University of Arizona, USA, created a timeline of the first known cases of covid-19 in the Chinese city.
For him, these data are an indication that the Sars-Cov-2 coronavirus would have even originated from an animal. Since the beginning of the pandemic, experts have debated the origin of the virus, in the absence of definitive evidence.
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A criticism of the animal origin theory said that, as health authorities warned about cases of a suspected disease linked to the animal market as early as December 30, 2019, this would have introduced a bias that led to the identification of more cases in the market of animals. than elsewhere, since attention was already focused on him.
To counter that argument, Worobey analyzed suspected cases of Covid-19 reported by two hospitals before the warning about the market was triggered. And these cases were also largely linked directly to the market, and those that weren’t were at least geographically concentrated around it.
“In this city of 11 million inhabitants, half of the first cases are connected to a place the size of a football field,” said the scientist to the American newspaper New York Times. “It is very difficult to explain this pattern if the outbreak has not started in the market.”
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