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  • Scheduling Vaccines

Two live virus vaccines can be given on the same day. How do you define “day”?

The “same day” generally means at the same visit. This interval has not been precisely defined and probably will never be since it would be extremely difficult to study in order to develop an evidence-based recommendation. Immunization programs (and their computer systems) likely define this differently. It seems reasonable that if two vaccines were given on the same date then they would both be valid.

Last reviewed: June 6, 2023

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