US vaccine panel to discuss waning effectiveness, new shots

FILE – This Jan. 10, 2013 file photo shows vials of flu vaccines in Philadelphia. No vaccine is perfect, and it can take many years to find out how well a new vaccine works and how long it lasts. The annual flu vaccine is a particularly hard one to nail. The virus changes quickly and spreads easily. U.S. health officials make their best guess each spring about the formula for the next flu season. (AP Photo/Matt Rourke, File)

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