In a major policy shift, federal health officials anticipate the shots will be made available to adults 65 and older as well as children and younger adults who have one or more risk factors that make them more vulnerable to severe COVID-19.

Top officials for the Food and Drug Administration (FDA) laid out new requirements for yearly updates to COVID-19 shots, saying they'd continue to use a streamlined approach that would make vaccines available to adults 65 and older as well as children and younger adults with at least one health problem that puts them at higher risk.