Will COVID-19 vaccines protect us? Does efficacy equal effectiveness?
The frontrunners in the COVID-19 vaccine race have emerged with different success rates for their shots in clinical trials, but what does that mean for the global fight against the pandemic?
U.S. drugmakers Pfizer-BioNtech and Moderna have each said their coronavirus vaccines have an efficacy rate of around 95% and a Russian project touted 92% efficacy for its Sputnik V vaccine.
Britain’s AstraZeneca announced an average efficacy rate of 70%, still well above the 50% rate that U.S. regulators have said they want to see before approving a COVID-19 vaccine for use.