COVID-19 was in US last December, CDC finds

https://www.rawstory.com/2020/12/americans-were-infected-with-19-far-earlier-than-first-us-case-cdc-study/

Based on analyzing blood donations from Dec. 13, 2019:

“The 7,389 samples, collected from nine states, were tested for SARS-CoV-2 reactive antibodies. SARS-CoV-2 is the scientific name for the coronavirus that causes Covid-19,” CNN reports. “Of the samples tested, at least 106 were found to have antibodies for SARS-CoV-2, including ones collected from California, Oregon and Washington from Dec. 13 through Dec. 16, 2019.”