WASHINGTON (AP) — The U.S. Food and Drug Administration is refusing to consider Moderna’s application for a new flu vaccine made with Nobel Prize-winning mRNA technology, the company announced Tuesday. The news is the latest sign of the FDA’s heightened scrutiny of vaccines under Health Secretary Robert F. Kennedy Jr., particularly those using mRNA technology , which he has criticized before and after becoming the nation’s top health official. Moderna received what’s called a “refusal-to-file”