The new coronavirus was circulating in Italy since September 2019, a study by the National Cancer Institute (INT) of the Italian city of Milan shows, signaling that COVID-19 might have spread beyond China earlier than previously thought.
PCRs of wastewater have put it around the world as early as March 2019 - https://www.darkdaily.com/studies-finding-remnants-of-sars-cov-2-in-sewage-suggest-covid-19-may-not-have-originated-at-wuhan-market-some-scientists-dispute-the-findings/
But these tests, both antibodies and PCR, do have false positives and false negatives, and such “fishing expeditions” can essentially emphasize false positives.
PCRs of wastewater have put it around the world as early as March 2019 - https://www.darkdaily.com/studies-finding-remnants-of-sars-cov-2-in-sewage-suggest-covid-19-may-not-have-originated-at-wuhan-market-some-scientists-dispute-the-findings/
But these tests, both antibodies and PCR, do have false positives and false negatives, and such “fishing expeditions” can essentially emphasize false positives.