The World Health Organization is reviving its stalled investigation into the origins of the Covid-19 virus as agency officials warn that time is running out to determine how the pandemic that has killed more than 4.7 million people world-wide began.
A new team of about 20 scientists—including specialists in laboratory safety and biosecurity and geneticists and animal-disease experts versed in how viruses spill over from nature—is being assembled with a mandate to hunt for new evidence in China and elsewhere.
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