H3N2 mutation in last year’s flu vaccine responsible for lowered efficacy: Penn researchers

The low efficacy of last year's influenza vaccine can be attributed to a mutation in the H3N2 strain of the virus, a new study reports. Due to the mutation, most people receiving the egg-grown vaccine did not have immunity against H3N2 viruses that circulated last year, leaving the vaccine with only about 30 percent effectiveness. Scott Hensley, PhD, ["]

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