The U.S. government will pay the vaccine maker Moderna $176 million to accelerate development of a pandemic influenza vaccine that could be used to treat bird flu in people, as concern grows about cases in dairy cows across the country, federal officials announced Tuesday. Moderna already has a bird flu vaccine in very early-stage testing that uses the same mRNA technology that allowed rapid development and rollout of vaccines to protect against COVID-19. The new funds from the U.S. Department o...