(4)As set out in Commission Delegated Regulation (EU) 2021/2288note, a standard acceptance period of 270 days is to apply to vaccination certificates indicating the completion of the primary vaccination series, be it a single-dose primary course, a two-dose primary series, or, in line with the vaccination strategy of the Member State of vaccination, a single dose primary course of a two-dose vaccine after having previously been infected with SARS-CoV-2. At the same time, no acceptance period is to be set for certificates indicating the administration of booster doses or additional doses administered to better protect individuals who mount inadequate immune responses following the completion of the primary vaccination series. References in this Regulation to booster doses should be understood as also covering such additional doses.
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