evidence: When COVID-19 vaccines were first tested, the U.S. Food and Drug Administration had asked that manufacturers demonstrate first and foremost their vaccine’s ability to reduce the risk of getting COVID-19. The Pfizer-BioNTech 2020 clinical trial showed a 95% efficacy in reducing that risk. Furthermore, real-world analysis performed after the worldwide COVID-19 vaccination campaign showed that all-cause mortality was lower among vaccinated individuals.