U.S. markets open in 7 hours 52 minutes
  • S&P Futures

    4,569.25
    +4.00 (+0.09%)
     
  • Dow Futures

    35,670.00
    +26.00 (+0.07%)
     
  • Nasdaq Futures

    15,560.00
    +15.00 (+0.10%)
     
  • Russell 2000 Futures

    2,290.60
    -3.30 (-0.14%)
     
  • Crude Oil

    83.83
    -0.82 (-0.97%)
     
  • Gold

    1,788.50
    -4.90 (-0.27%)
     
  • Silver

    24.08
    -0.01 (-0.03%)
     
  • EUR/USD

    1.1610
    +0.0008 (+0.07%)
     
  • 10-Yr Bond

    1.6190
    0.0000 (0.00%)
     
  • Vix

    15.98
    +0.74 (+4.86%)
     
  • GBP/USD

    1.3760
    -0.0003 (-0.02%)
     
  • USD/JPY

    114.0200
    -0.1090 (-0.10%)
     
  • BTC-USD

    60,915.15
    -1,583.80 (-2.53%)
     
  • CMC Crypto 200

    1,484.26
    -20.89 (-1.39%)
     
  • FTSE 100

    7,277.62
    +54.80 (+0.76%)
     
  • Nikkei 225

    29,034.63
    -71.38 (-0.25%)
     

Covid Vaccine Efficacy Numbers, Explained

In this article:
  • Oops!
    Something went wrong.
    Please try again later.

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