Booster protection wanes against symptomatic Omicron infections, British data suggests New York Times
- "Among those who received two doses of the AstraZeneca vaccine, a booster of the Pfizer or Moderna vaccine was 60% effective at preventing symptomatic disease 2 to 4 weeks after the shot. But after 10 weeks, the Pfizer booster was 35% effective, and the Moderna booster was 45% effective."
- "The report was based on an analysis of 148,000 Delta cases and 68,000 Omicron cases in the U.K. through Dec. 20. "
From SARS-CoV-2 variants of concern and variants under investigation in England
- Technical briefing 33 23 December 2021 below
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