Next year's flu vaccine is on track for a complete overhaul to provide protection against three new and different virus strains -- hopefully better protection than this year's version.
Federal health advisers have unanimously recommended the new recipe, echoing the World Health Organization.
Now the question is whether vaccine manufacturers can make such a big change in time to produce more than 100 million doses by next fall.
The flu vaccine must be reformulated every year to keep up with the fast-evolving influenza virus. This year the government made a rare wrong bet on which strains would cause the most disease.