Seasonal Flu Vaccine Even Less Effective Than Thought: CDC

February 27, 2015 12:00 AM

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THURSDAY, Feb. 26, 2015 (HealthDay News) -- This year's flu vaccine is even more disappointing than previously reported, showing just 18 percent effectiveness against the dominant H3N2 strain of flu, health officials reported Thursday.

That's a drop from the 23 percent protection level estimated for the flu shot earlier in the season, said experts at the U.S. Centers for Disease Control and Prevention.

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