Pfizer’s COVID-19 vaccine booster for children under age 5 was 80.3% effective and well tolerated in a clinical trial involving 1,678 children who received the 3-microgram dose at least two months after the primary vaccine series at a time when the omicron variant was predominating, the company today. Pfizer expects to submit the data to the Food and Drug Administration this week for the company’s emergency use application.

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