Pfizer, BioNTech say their COVID-19 vaccine is more than 90% effective

Pfizer Inc on Monday said its experimental vaccine was more than 90% effective in preventing COVID-19 based on initial data from a large study, a major victory in the fight against a pandemic that has killed over 1 million people, roiled the world’s economy and upended daily life. Pfizer and German partner BioNTech SE are the first drugmakers to show successful data from a large-scale clinical trial of a coronavirus vaccine. If authorized, the number of vaccine doses will initially be limited.

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