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.
Her evolution was the product of a collaboration between two separate but increasingly allied groups that peddle misinformation: a small but active corner of the Chinese diaspora and the highly influential far right in the United States.
Dr. Yan’s trajectory was carefully crafted by Guo Wengui, a fugitive Chinese billionaire, and Stephen K. Bannon, a former adviser to Mr. Trump.
They put Dr. Yan on a plane to the United States, gave her a place to stay, coached her on media appearances and helped her secure interviews with popular conservative television hosts like Tucker Carlson and Lou Dobbs, who have shows on Fox. They nurtured her seemingly deep belief that the virus was genetically engineered, uncritically embracing what she provided as proof.
“I said from Day 1, there’s no conspiracies,” Mr. Bannon said in an interview. “But there are also no coincidences.”