National Institutes of Health officials have urged scientists to remove all references to mRNA vaccine technology from their grant applications, two researchers said, in a move that signaled the agency might abandon a promising field of medical research. The mRNA technology is under study at the NIH for prevention and treatment of infectious diseases, including flu and AIDS, and also cancer. It was deployed in the development of covid-19 vaccines credited with saving 3 million lives in the U.S. alone " an accomplishment President Donald Trump bragged about in his first term.