Pfizer and BioNTech have begun submitting data to U.S. regulators to seek emergency use authorization of their COVID-19 vaccine for children under the age of 5, despite weaker-than-expected immune responses in their clinical trial of 2- to 4-year-olds https://t.co/S4sQN6vcR0 pic.twitter.com/XZLe6VBzF1— Reuters (@Reuters) February 2, 2022
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