A new, nanoparticle vaccine could one day grant patients immunity to the flu with fewer trips to the doctor and without health officials correctly guessing which flu strains will become dominant each year. A new, nanoparticle vaccine could one day grant patients immunity to the flu with fewer trips to the doctor and without health officials correctly guessing which flu strains will become dominant each year. Mice given the vaccine, developed at Univers... [3674 chars]