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Covid-19 Deaths in Delta Surge Trend Younger in Unvaccinated People - The Wall Street Journal

Covid Vaccine Efficacy Numbers, Explained

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Covid Vaccine Efficacy Numbers, Explained

Covid Vaccine Efficacy Numbers, Explained

Recent studies have shown that the effectiveness of Covid-19 vaccines is decreasing, though experts say the shots still work well. WSJ explains what the numbers mean and why they don’t tell the full story. Photo illustration: Jacob Reynolds/WSJ

Sept. 13, 2021 5:30 am ET

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A surge in Covid-19 deaths caused by the highly contagious Delta variant is hitting working-age people hard while highlighting the risks for people who remain unvaccinated.

Federal data show Covid-19 deaths among people under 55 have roughly matched highs near 1,800 a week set during last winter’s surge. These data show weekly tallies for overall Covid-19 deaths, meanwhile, remain well under half of the pandemic peak near 26,000 reached in January.