The trial showed a 94.1% reduction in the number of symptomatic COVID-19 cases in the people who received the vaccine (11 out of 14,134 vaccinated people got COVID-19 with symptoms) compared with people who received dummy injections (185 out of 14,073 people who received dummy injections got COVID-19 with symptoms). People did not know whether they received the vaccine or the dummy injections.Įfficacy was calculated in around 28,000 people from 18 to 94 years of age who had no sign of previous infection. Half received the vaccine and half were given dummy injections. The trial involved around 30,000 people in total. A very large clinical trial showed that Spikevax was effective at preventing COVID‑19 in people from 18 years of age.
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