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Pfizer: Our COVID-19 vaccine prevents 94 percent of asymptomatic infection

Christian Fernsby |
Pfizer and BioNTech said on Wednesday that real-world data from Israel suggests that their COVID-19 vaccine is 94% effective in preventing asymptomatic infections, meaning the vaccine could significantly reduce transmission.

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The companies also said the latest analysis of the Israeli data shows the vaccine was 97% effective in preventing symptomatic disease, severe disease and death. That is basically in line with the 95% efficacy Pfizer and BioNTech reported from the vaccine's late-stage clinical trial in December.

The analysis also shows real-world evidence of the vaccine's effectiveness against a highly infectious variant of COVID-19 first discovered in Britain, known as B.1.1.7. More than 80% of the tested specimens when the analysis was conucted were variant B.1.1.7.


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