Two UC San Diego faculty members teamed up with other viral experts to try to determine how the COVID-19 virus jumped from an animal at a Chinese market to humans at the start of the global pandemic.
“If you have a stall in the market, you’re going to have some animal DNA from whatever animal was held in that stall. You're going to have DNA from feces or other matter from other animals nearby. You’re going to have some human DNA because somebody’s hair fell in the sample,” Moshiri said.
Wertheim said their research showed there were probably two lineages of COVID-19 infection at the market, meaning the virus jumped to humans not once but twice. They believe the one involving the raccoon dog exploded into a pandemic. Some U.S. agencies have suggested that the COVID-19 pandemic resulted from a “lab leak” in Wuhan. Wertheim said the data tells a different story.
“The data don’t support any of those origin hypotheses, out of a lab. And in fact the findings in our recent report are exactly what you would expect under a natural zoonotic origin of SARS COv-2,” Wertheim said. Zoonotic means moving from one species to another, in this case, probably from a raccoon dog to a person.
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