It looks like there will be a need for multiple vaccine shots for the Pfizer Covid-19 vaccine, since one shot is not enough to cope with the mutant strains. That is the present mutant strains, let alone those coming over the next decade, and hundreds of years, maybe thousands of years. That might be why the hi-tech freaks are advocating going full robot and abandoning biology, totally. Sounds good, until one thinks about computer viruses. It will be like Microsoft word, everywhere.