By Maggie Fox / NBC News
November 25, 2015

Federal regulators have signed off on a new type of flu vaccine with a booster in it, with the hope of better protecting seniors from the virus.

It’s the first flu vaccine to include what’s called an adjuvant — a compound that helps stimulate the immune system so that a vaccine is more effective.

It’s aimed at people over 65, who typically have a poor immune response to vaccines.

“Immunizing individuals in this age group is especially important because they bear the greatest burden of severe influenza disease and account…

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Contact us at editors@time.com.

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