The origins of Covid-19 remain unknown, and a gamut of hypotheses, conspiracy theories and studies have raised more questions than answers about how the virus that causes the disease emerged and spread around the world.
“We are scientists reviewing what’s known and saying, ‘Where does the evidence fall on the different hypotheses that are out there?’” said Daszak, who is in the unique position of being part of both the WHO international team and the Lancet task force. “What we can do is bring people together who really know what happens in an outbreak, what happens in a biosafety lab, what happens with viral sequences and evolution … what happens in a wildlife market,” said the disease ecologist, known for his research on viral zoonosis.
The team will step into a complicated landscape, because the origins of the virus have become the object of intense global interest, prompting the flood of research and conflicting theories about where it came from, but few solid conclusions. The Chinese government has countered this message with its own line that even if the virus was identified in Wuhan, it did not necessarily originate there – although it has yet to release full findings from investigations in the city. A top Chinese Centre for Disease Control and Prevention official has also suggested that the virus could have originally arrived in China via imported seafood, without providing evidence.
Although the closest known relative to the novel coronavirus was found in a cave in southwest China’s Yunnan province, the horseshoe bat species that carries it has a range across Southeast Asia. Less sampling of coronaviruses in bats has been done in China’s neighbouring countries of Myanmar, Vietnam and Laos, according to Daszak.
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