Every year, people line up to get flu vaccines at pharmacies and doctor’s offices because the flu develops new strains, requiring the vaccines to be updated. What if there was a single flu vaccine you could take to last for decades against any flu virus strain? Such a thing would make yearly trips to get vaccinated obsolete and save tons of money in medical costs. Scientists at the National Institute of Allergy and Infectious Diseases (NIAID) believe this is possible.