Flu fight hindered by virus mutation

January 18, 2015 3:19 AM

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The dynamic between the flu virus and vaccine plays out like a race to the finish.

Each year the flu vaccine undergoes a change, at the behest of experts in the medical field, so it can best combat the upcoming strains of the season. But it's not an exact science. And just as the vaccine changes at the hands of experts, the virus' genes mutate in order to ensure its continuing sur...

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