https://www.sciencemag.org/news/2020/11/absolutely-remarkable-no-one-who-got-modernas-vaccine-trial-developed-severe-covid-19
Only 11 people who received two doses of the vaccine developed COVID-19 symptoms after being infected with the pandemic coronavirus, versus 185 symptomatic cases in a placebo group. That is an efficacy of 94.1%, the company says, far above what many vaccine scientists were expecting just a few weeks ago. More impressive still, Moderna’s candidate had 100% efficacy against severe disease. There were zero such COVID-19 cases among those vaccinated, but 30 in the placebo group, including one death from the disease.
