MATTHEW PERRONE AP Health Writer

WASHINGTON (AP) — U.S. regulators approved updated COVID-19 shots Wednesday but limited their use for many Americans — and removed one of the two vaccines available for young children. The new shots from Pfizer, Moderna and Novavax are approved for all seniors. But the Food and Drug Administration narrowed their use for younger adults and children to those with at least one high-risk health condition, such…