Researchers around the world are working on pan-coronavirus vaccines that would block many related viruses at once, including ones that have yet to infect anyone
A pan-coronavirus vaccine could protect people against Covid-19 variants as well as the next pandemic virus
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
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