A single shot of the Pfizer-BioNTech vaccine is 85% effective in preventing symptomatic disease 15 to 28 days after being administered, an Israeli study found—news that could help in setting vaccine priorities world-wide.
source https://www.wsj.com/articles/single-dose-of-pfizer-vaccine-is-85-effective-israeli-study-shows-11613723218?mod=pls_whats_news_us_business_f
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