One-fifth of states have active measles outbreaks as confirmed cases nationwide keep ticking up, according to the U.S.

Scientists have found that receiving a COVID-19 booster shot in the same arm as the initial dose triggers a faster and more effective immune response, thanks to primed macrophages in nearby lymph ...

One-fifth of states have active measles outbreaks as confirmed cases nationwide keep ticking up, according to the U.S. Centers for Disease Control and Prevention.