Zero biological evidence exists for a lab leak of Coronavirus - Paper chinadaily.com.cn | Updated: 2021-07-17 21:11 Share [Photo/Agencies] A critical review paper on the origins of SARS-COV-2 summarises and reviews the existing scientific evidence for the origin of the virus, which causes COVID-19 in humans, concluding that overwhelmingly its most likely origin is zoonotic – a transfer from an animal source to human infection, SciTech Daily reports. The paper was published by an international team of eminent biologists, led by Professor Edward Holmes from the University of Sydney and Professor Andrew Rambaut from the University of Edinburgh. The authors also emphasize that there currently exists zero evidence for such a laboratory origin.