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What is the recommended COVID-19 vaccine dosage schedule?

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The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
The Editors of Encyclopaedia Britannica

For the 2025–2026 season, most people are advised to receive one updated COVID-19 vaccine. Children 6 to 23 months may need multiple doses if they are not yet vaccinated, while older children and adults up to age 64 typically require only a single dose. Adults 65 and older are recommended to receive two updated doses.