Don't take my husband personally, I'm the medical expert in the family - we know this "virus" was engineered. Ergo, that they call it a "new coronavirus" or not, it was most likely an augmented flu strain meant to be unrecognizable by basics and puzzling to experts. Flu comes with vomiting. The Rona, does not. All they had to do was engineer it to particularly attack the respiratory system. I also got sick with bronchitis this winter. Went to the ER (something I have to be near dead to do) but tested negative for COVID twice. I have had friends that had "the Rona" and said it was the worst and unlike anything they've ever had. Now, granted, the power of suggestion is strong. Combine that with an augmented or just a more potent flu strain and this is feasible to me.