Look, just trying to be civil with you. You are wrong, one vaccine may not cover all variants and mutations. Just like the flu shot, it is different every year because of variants. Hence, boosters come along. Are you insinuating calling the polio vaccine was a mistake? Or the smallpox vaccine a mistake? These were all "experimental" when first introduced and the world is better for them. mRNA vaccines have been around for over 30 years, they are not new. As for COVID-19, it is a variant of the SARS virus....evolved to what it is today.