More information about the Pfizer-BioNTech COVID-19 Vaccine. Some details explained. A single dose of the Pfizer/BioNTech vaccine gives people 85% protection from Covid-19, according to a study from Israel.

Pfizer has consistently said that two doses of the vaccine are needed for high efficacy. In clinical trials, it reported efficacy of 52.4% after one dose, but 95% after two doses.

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