I think the real test was: How many people are immune from 19 because they had some prior version of a covid? This was the Chinese weapons test. And i think it failed. SARS is bad but really. without 6 governors murdering 250,000 old folks in facilities not designed to protect them you have nothing more than a regular flu season. On the Diamond Princess ship 80% never got sick on a closed ship at sea. That is natural immunity as well. And you can’t use PCR tests as measures. only antibody test are valid.
How many people who contracted and survived swine flu H1N1 in 2009 didn't get COVID-19 in 2019-2021?