The Food and Drug Administration has approved a new kind of flu vaccine for older people, the first made with the same mRNA technology that was key to ending the COVID-19 pandemic, said the manufacturer, Moderna.The shot, named mFlusiva, is intended for adults who are 50 and older. Other brands of flu shots already have begun arriving in pharmacies ahead of fall vaccination season, and Moderna said late Wednesday that it expects some of its new version to be available soon at select retailers.While there already are multiple flu vaccine options in the U.S., including three specifically recommended for people age 65 or older, tens of thousands of Americans die from influenza every year and older adults are among the most vulnerable.Flu vaccines must be updated annually to best match circulating strains of the virus.