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…
As more U.S. adults get their Covid-19 vaccines, a variety of side effects are emerging. WSJ’s Daniela Hernandez speaks with an infectious disease specialist on what is common, what isn’t and when to seek medical attention. Photo: Associated Press More…
Test kits have been one of the main ways to determine if a patient has coronavirus, but results from throat-swab tests can be inaccurate. WSJ visited a lab in Singapore to see how the kits work and find out why…