A report on the origins of Covid-19 by a US government national laboratory concluded that the hypothesis of a virus leak from a Chinese lab in Wuhan is plausible and deserves further investigation, the Wall Street Journal said 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 to by the State Department when it conducted an inquiry into the pandemic's origins during the final months of the Trump administration, the WSJ report said.

Lawrence Livermore's assessment drew on a genomic analysis of the COVID-19 virus, the Journal said. Lawrence Livermore declined to comment on the Wall Street Journal report.

US 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, Biden said.

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