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#1 31-05-2020 10:25:39

ritcha
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Scientists trace the roundabout route that coronavirus took from bats

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Two newly published studies shed light on the origins and spread of the coronavirus pandemic, starting with bats and pangolins in China and ending up with New York’s dramatically deadly outbreak.

One study, published today in the open-access journal Science Advances, analyzed 43 genome sequences from three strains of coronavirus similar to the one that causes COVID-19 in humans. These strains were identified in bats and in pangolins, anteater-like animals prized for their scales. The two pangolins that yielded samples of coronavirus were smuggled into China and seized by customs officials.

The type of coronavirus that has caused the human pandemic, SARS-CoV-2, is more similar to bat viruses than to pangolin viruses. But a key piece of genetic material, relating to the ability of the SARS-CoV-2 spike protein to bind itself to human cells, was identified in pangolin viruses but not in bat viruses.

None of the viruses that were studied is likely to be in the direct line leading to the virus that made the leap to humans, but their diversity suggests that SARS-CoV-2 went through cross-species evolution before making the leap to humans.

“Very much like the original SARS that jumped from bats to civets, or MERS that went from bats to dromedary camels, and then to humans, the progenitor of this pandemic coronavirus underwent evolutionary changes in its genetic material that enabled it to eventually infect humans,” senior study author Feng Gao, a professor of medicine at Duke University School of Medicine, said in a news release.
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#2 01-06-2020 10:54:13

downlload Mp3
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Re: Scientists trace the roundabout route that coronavirus took from bats

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