Does the Serologic results from US Blood Donations to Identify SARS-CoV-2–Reactive Antibodies indicate SARS-2 was in the USA in 2019. Is it possible the result is due to cross-reactivity to other coronavirus. User Ducky181, in the Epidemiology subreddit, 22 Nov 2021
[Dec 2019] Antibodies present in US blood samples User GhoulChaser666, in the COVID Timeline subreddit, 04 Oct 2021
Serologic Testing of US Blood Donations to Identify Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2)–Reactive Antibodies: December 2019–January 2020 User dragger2k, in the Radio Orbit Discussion Forum subreddit, 28 Apr 2021
Serologic Testing of US Blood Donations to Identify Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2)–Reactive Antibodies: December 2019–January 2020 | Clinical Infectious Diseases User Puzzleheaded-Grand85, 21 Apr 2021
Serologic Testing of US Blood Donations to Identify Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2)–Reactive Antibodies: December 2019–January 2020 User fannybear, in the COVID-19 subreddit, 12 Apr 2021
Serologic testing of U.S. blood donations to identify SARS-CoV-2-reactive antibodies: December 2019-January 2020 | Clinical Infectious Diseases User Puzzleheaded-Grand85, 25 Jan 2021
Serologic testing of U.S. blood donations to identify SARS-CoV-2-reactive antibodies: December 2019-January 2020 | Clinical Infectious Diseases User Puzzleheaded-Grand85, 20 Jan 2021
Serologic testing of U.S. blood donations to identify SARS-CoV-2-reactive antibodies: December 2019-January 2020 | Clinical Infectious Diseases User Puzzleheaded-Grand85, 10 Dec 2020
COVID was infecting people in the US since December 2019 - published in CID User vishnui_complex, in the /r/medicine: a subreddit for medical professionals subreddit, 02 Dec 2020
*FIVE MILLION COVID-19 CASES* in the USA in December *2019* User killuazoldyk21, in the Chomsky: Postings on the "most important intellectual of our time." subreddit, 02 Dec 2020
Serologic testing of U.S. blood donations to identify SARS-CoV-2-reactive antibodies: December 2019-January 2020 User kitchenwitch2017, 02 Dec 2020
Serologic testing of U.S. blood donations to identify SARS-CoV-2-reactive antibodies: December 2019-January 2020 | Clinical Infectious Diseases User D-R-AZ, in the COVID-19 Discussion subreddit, 01 Dec 2020
Earlier estimate of SARS-COV-2 spread in U.S. - mid December 2019 User Deltanonymous-, in the Novel Coronavirus (COVID-19) subreddit, 01 Dec 2020
Serologic testing of U.S. blood donations to identify SARS-CoV-2-reactive antibodies: December 2019-January 2020 | Clinical Infectious Diseases User Lilyo, in the Reddit Science subreddit, 01 Dec 2020
Serologic testing of U.S. blood donations to identify SARS-CoV-2-reactive antibodies: December 2019-January 2020 User Lilyo, in the News subreddit, 01 Dec 2020
Serologic testing of U.S. blood donations to identify SARS-CoV-2-reactive antibodies: December 2019-January 2020 User MummersFart, in the COVID-19 subreddit, 01 Dec 2020