Pfizer has expanded its COVID-19 vaccine trial to include teens. Some say it's risky. Others argue it's necessary. - Get World Best News

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Pfizer has expanded its COVID-19 vaccine trial to include teens. Some say it's risky. Others argue it's necessary.

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After months of testing its COVID-19 candidate vaccine in adults, Pfizer recently lowered the age of participation to 16.

      

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