Top-ranking Food and Drug Administration officials picked by the Trump administration under Health and Human Services Secretary Robert F. Kennedy Jr. overrode career staff at the agency to limit , The new memos from the FDA show how the agency’s vaccine chief, Dr. Vinay Prasad, personally intervened to place restrictions on COVID shots from vaccine makers Novavax and Moderna., The decisions by the official, Dr. Vinay Prasad, the agency’s new chief medical and scientific officer, stunned agency veterans. Records show that the F.D.A.’s vaccine staff members had signed off on approving the Novavax vaccine, an alternative to mRNA shots and weeks later on the next-generation of the mRNA Covid shot by Moderna for anyone 12 and older., A top official at the Food and Drug Administration recently overruled government scientists on the availability of two COVID-19 vaccines., The leader of the U.S. FDA's division that oversees vaccines, Vinay Prasad, overruled the recommendations of his agency's staff by limiting broader use of two COVID-19 vaccines. The FDA scientists , .