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  1. Nov 17, 2021 · Two mRNA vaccines, Moderna and Pfizer-BioNtech, performed best. They are followed by AstraZeneca, which in a trial in Canada was 68-96% effective (though a trial in England gave a worse...

  2. Aug 19, 2021 · The Pfizer–BioNTech and Oxford–AstraZeneca COVID-19 vaccines are effective against the highly infectious Delta variant of SARS-CoV-2 — but their protection drops away over time, a study of...

    • Katharine Sanderson
    • 2021
  3. Aug 6, 2021 · A single dose of the Covid-19 vaccine made by Johnson & Johnson is highly effective in preventing severe illness and death from the Delta and Beta variants of the coronavirus, data from a...

    • Apoorva Mandavilli
  4. Jul 2, 2021 · A study based on real-world data from the U.K. found that two doses of the Pfizer vaccine were 88% effective at preventing COVID-19 as a result of an infection with the Delta variant. That’s just...

  5. Jul 8, 2021 · All the data so far shows the vaccines are highly effective at preventing serious disease or hospitalization, Dr. Anthony Fauci said. Vaccination is also imperative to preventing mutations,...

    • Mary Louise Kelly
  6. Aug 20, 2021 · Data from other countries shows a wide range of vaccine effectiveness against infection with the delta variant, but studies have generally found the protection is less robust than it was against...

  7. Dec 25, 2021 · The short-term effectiveness of vaccines, especially mRNA-based vaccines, for the prevention of the Delta variant infection, hospitalization, severe infection, and death is supported by this study.

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