I worked in an inner city Children’s hospital then. There were a lot of respiratory infections that winter. In January, something went thru almost all our staff. Come March, most of the nurses were convinced they must have had Covid. Our hospital offered testing for Covid antibodies that spring. Not even 1 person had antibodies, meaning, no, it wasn’t Covid everyone had in January.
So many people think the same thing, that they probably had it that winter. My thought….Covid did not hit all the healthy adults in December 2019 - February 2020, then come back to hospitalize & kill the elderly, obese, diabetics etc in March. Unless you were in Asia or Europe in December & January, you didn’t have Covid.