Mutation in Flu Virus: Centers for Disease Control and Prevention

If you got a flu shot recently – don’t be surprised if you still get sick. The C-D-C says the current virus has mutated, making this year’s vaccination less effective.

In an advisory to doctors, the Centers for Disease Control and Prevention said flu virus samples taken from October 1st through November 22nd showed just under half, 48-percent, matched the current influenza strains in this year’s vaccine. 52-percent of the samples were different, indicating a mutation or drift of the strain. The C-D-C still recommends getting vaccinated – since it can still decrease the severity of the illness.


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