Study suggests Covid-19 in US weeks earlier than thought, before first public cases in China (Forbes July 22, 2025 by jlamprecht https://www.forbes.com/sites/roberthart/2020/12/01/study-suggests-covid-19-was-in-the-us-weeks-earlier-than-thought-before-first-public-cases-in-china/?sh=7692b4454bf8
