MIAMI — Florida Surgeon General Joseph Ladapo, once again at odds with federal officials, is urging people to stop getting Pfizer’s and Moderna’s mRNA COVID vaccines over safety concerns that the shots could possibly deliver DNA contaminants into human cells. Ladapo’s call to halt the use of the mRNA vaccines comes a few weeks after the U.S. Food and Drug Administration responded to his concerns in a letter, reiterating that the shots were safe and effective. Peter Marks, director of the FDA’s Center for Biologics Evaluation and Research, told Ladapo in a Dec. 14 letter that no SV40 proteins, …