CDC: Flu vaccine largely ineffective this season

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This season's flu vaccine is only 23% effective, the Centers for Disease Control and Prevention has warned. That could make this a doozy of a winter for residents and staff.

Federal official said that the reason for this year's vaccine being largely ineffective is that it doesn't include the virus that is making so many people ill.

The flu vaccine is reformulated each year, based on what experts think will be the top strains likely to cause the most damage. But those decisions tend to be made in early spring, which can reduce the odds that late-breaking strains will be addressed, experts say. Even in good years, vaccines are usually only 60% effective.


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