Oct 8, 2013 — A decades-long effort to prevent one of the world's leading scourges has resulted in a vaccine with only modest efficacy. Still, the shot has the potential to save hundreds of thousands of lives each year. So its developers are seeking regulatory approval in 2014.
Feb 21, 2013 — It appears that the current batch of flu vaccine is only about 9 percent effective in protecting people 65 and older against the H3N2 flu strain that's causing the most illness. Even so, health officials still recommend vaccination.