U.K. Approves Covid Booster Vaccine That Targets Two Variants

Britain on Monday became the first country to authorize a coronavirus vaccine that targets two variants, the original virus and Omicron, the variant that became dominant over the winter.

Half of each dose of the Moderna-made vaccine will target the original variant, and the other half will target Omicron. In clinical trials, the vaccine, an updated version of Moderna’s original Covid vaccine,