It has been the Holy Grail of influenza research -- how to create just one vaccine that will protect against the hundreds of different flu strains that exist every year. With a new scientific discovery, researchers are now a major step closer to that goal. "We have identified a common Achilles heel of all influenza viruses and this really allows us then to work on a universal vaccine that will get us lifelong immunity," said Dr. Wayne Marasco, a researcher at the Dana-Farber Cancer Institute...Full Story