While severe COVID-19 symptoms are extremely rare in infected children, they can pass on the virus to high-risk groups such as the elderly.That makes determining the effectiveness of a potential vaccine in children crucial, as vaccines work differently in kids and adults, the FDA said in its guidelines in June.
Last month, Pfizer scaled up its trial to about 44,000 participants, from up to 30,000, to enroll people as young as 16 and those with chronic, stable HIV, hepatitis C and hepatitis B.
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