If you have had Covid-19 before, why can you get it again? WSJ’s Daniela Hernandez explains what the possibility of reinfections means for the future of public-health policy and the Covid-19 pandemic. Illustration: David FangOmicron-targeting Covid-19 vaccine
as a booster shot, paving the way for the variant shot to play a role in a planned fall vaccination campaign to shore up immune defenses against the virus. The so-called bivalent vaccine is directed against both the original strain of SARS-CoV-2, the virus that causes Covid-19, and the first Omicron variant, also known as BA.1, which drove large waves of infection over the winter.
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