My guess, covid was started by the flu shot given out in fall/winter of 2019. We all got sick here after mom and granddaughter had their yearly flu shot, same symptoms as covid but too early in 2020, this was before they came out with the covid tests. Flu shot shedding, mom also had breast cancer after recovering from 'covid', I was taking her for radiation treatments during the lockdown... 100 miles each day round trip, the no traffic part was pretty nice.