All one had to do was look at cases where malaria was present in large numbers...my wife had it in February 2020 ...was treated for the Asain Flu...Zinc and a few other drugs..took three weeks but she survived
I still think I may have had it in late February 2020. I had two night with a light fever right after a West Coast trip, right before everything went nuts. Went through Seattle, which was one of the early hot spots.
While I’ve added to the supplement stack, I had D, C, some zinc even back then.