This image provided by GlaxoSmithKline in October 2017 shows the company's Shingrix vaccine. On Wednesday, Oct. 25, 2017, a federal panel of experts recommended that as many as 20 million Americans who were vaccinated against shingles get revaccinated with a new shot. The panel said doctors should first opt for Shingrix, licensed a week earlier, which uses a new ingredient to boost immunity. (GlaxoSmithKline via AP)
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