Presume you refer to COVID-19 vaccine, which many suggest may be required once yearly, as not fully clear if herd immunity can occur in presence of a virus which can rapidly mutate into a variant. This is yet to be decided, but may be very well similar to flu vaccine. Stay tuned, as it will be clear when evaluation of need for boosters is decided.
Answered 8/19/2021
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Vaccines have different schedules, the majority provide long lasting immunity after 1 or 2 boosters. Influenza is typically recommended on an annual basis and COVID may become similar per early predictions.
Answered 8/19/2021
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Visit this site for information on vaccination schedule for adults: https://www.cdc.gov/vaccines/schedules/hcp/imz/adult.html
Answered 8/17/2021
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