evidence: As the virus that causes COVID-19 has evolved, the vaccines have become less effective in preventing symptomatic infection while remaining highly effective in preventing severe disease and death. This shift has been misrepresented by anti-vaccine influencers who falsely claim that it means the vaccines don’t work and have been ineffective all along. [...] Although the vaccines remained effective against severe illness and death from COVID-19, they were somewhat less effective at preventing infection from delta. [...] Dagan, Noa, et al. "BNT162b2 mRNA Covid-19 Vaccine in a Nationwide Mass Vaccination Setting." New England Journal of Medicine. 15 Apr 2021.