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

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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