Pfizer, Moderna COVID-19 vaccines effective after first shot, US Centers for Disease Control and Prevention study finds – ABC News

The Pfizer and Moderna coronavirus vaccines reduced the risk of infection by 80 per cent two weeks or more after the first of two shots, according to data from a real-world US study.
Key points:

• The study looked at the effectiveness of the mRNA vaccines among 3,950 participants over 13 weeks
• The CDC said the study results provide reassurance that people start to develop protection from the vaccine two weeks after their first dose
• It comes weeks after real-world data suggested the Pfizer vaccine was…

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