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
WSJ Explains
News moves fast, and there’s not always time to untangle the complex forces driving the day’s biggest stories. WSJ Explains breaks down big market moves, business and economic trends, and scientific developments to help you stay ahead of the curve.
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