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How effective is the Pfizer-BioNTech (BNT162b2) COVID-19 vaccine? A real-world study in Sweden – News-Medical.Net
Investigating a population in southern Sweden, a new study has found that a single dose of the vaccine is only about 42% effective in preventing coronavirus disease…

Investigating a population in southern Sweden, a new study has found that a single dose of the vaccine is only about 42% effective in preventing coronavirus disease 2019 (COVID-19). But seven days after the second dose, the vaccine can prevent COVID-19 in 86% of the population.
Several vaccines against COVID-19 have now been approved in different countries around the world. In the European Union, four vaccines have been approved for use. Two of these are the Moderna and Pfizer-BioNTech mRNA vaccines.
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