Nearly two years into the pandemic, with the death toll passing 5.2 million, more scientists are trying to keep the focus on the animal-to-human theory for the cause of the virus in the hope what's learned can help humans fend off new viruses and variants.
Last month, Worobey published a COVID-19 timeline linking the first known human case to the Huanan Seafood Wholesale Market in Wuhan, China, where live animals were sold.
The continuing search for answers has inflamed tensions between the U.S. and China, which has accused the U.S. of making it the scapegoat for the disaster. Some experts fear the pandemic’s origins may never be known.Scientists said in the Cell paper that SARS-CoV-2, which causes COVID-19, is the ninth documented coronavirus to infect humans. All previous ones originated in animals.
Earlier this year, a joint report by the World Health Organization and China called the transmission of the virus from bats to humans through another animal the most likely scenario and a lab leak “extremely unlikely.” Since COVID-19 emerged, many types of animals have gotten infected, including pet cats, dogs and ferrets; zoo animals such as big cats, otters and non-human primates; farm-raised mink; and white-tailed deer.
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