Dr. Li-Meng Yan wanted to remain anonymous. It was mid-January, and Dr. Yan, a researcher in Hong Kong, had been hearing rumors about a dangerous new virus in mainland China that the government was playing down. Terrified for her personal safety and career, she reached out to her favorite Chinese YouTube host, known for criticizing the Chinese government.

Within days, the host was telling his 100,000 followers that the coronavirus had been deliberately released by the Chinese Communist Party. He wouldn’t name the whistle-blower, he said, because officials could make the person “disappear.”

By September, Dr. Yan had abandoned caution. She appeared in the United States on Fox News making the unsubstantiated claim to millions that the coronavirus was a bio-weapon manufactured by China.

Overnight, Dr. Yan became a right-wing media sensation, with top advisers to President Trump and conservative pundits hailing her as a hero. Nearly as quickly, her interview was labeled on social media as containing “false information,” while scientists rejected her research as a polemic dressed up in jargon.
https://www.nytimes.com/2020/11/20/business/media/steve-bannon-china.html