A report on the origins of Covid-19 by a US government national laboratory concluded the hypothesis claiming the virus leaked from a Chinese lab in Wuhan is plausible and deserves further investigation, The Wall Street Journal reported on Monday, citing people familiar with the classified document.
The study was prepared in May 2020 by the Lawrence Livermore National Laboratory in California and was referred by the State Department when it conducted an inquiry into the pandemic's origins during the final months of the Trump administration, the report added.
Lawrence Livermore's assessment drew on genomic analysis of the Covid-19 virus, the Journal said. Lawrence Livermore declined to comment on the Wall Street Journal report.
President Joe Biden said last month he had ordered aides to find answers to the origin of the virus.
US intelligence agencies are considering two likely scenarios - that the virus resulted from a laboratory accident or that it emerged from human contact with an infected animal - but they have not come to a conclusion, he said.
A still-classified US intelligence report circulated during former President Donald Trump's administration alleged that three researchers at China's Wuhan Institute of Virology became so ill in November 2019 that they sought hospital care, US government sources said.
US officials have accused China of a lack of transparency on the virus' origin, a charge Beijing has denied.
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