Researchers are ushering in a new era of vaccine design that promises to be faster, more precise, and capable of tackling humanity’s most stubborn diseases.

The FDA action comes weeks after US Health Secretary Robert F. Kennedy Jr said the government would no longer recommend the COVID vaccine for healthy children or pregnant people.

In this retrospective cohort study, COVID-19 booster vaccinations were associated with significant protection against severe COVID-19, with a favorable number needed to vaccinate among persons with ...