U.S. intelligence agencies are examining reports that researchers at a Chinese virology laboratory were seriously ill in 2019, a month before the first cases of COVID-19 were reported, according to U.S. government sources who cautioned that there is still no proof the disease originated at the lab.
A still-classified U.S. intelligence report circulated during former U.S. President Donald Trump's administration alleged that three Wuhan Institute of Virology (WIV) researchers became so ill in November 2019 that they sought hospital care, sources familiar with U.S. intelligence reporting and analysis said, speaking on condition of anonymity.
It remained unclear whether these researchers were hospitalized or what their symptoms were, one of the sources said. The virus first appeared in Wuhan and then spread worldwide.
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