“The European Union is considering a nine-month expiration date on its Covid-19 vaccine certificates, which allow tourists certain freedoms to travel while the coronavirus┬ápandemic still rages.

The European Commission, the executive arm of the EU, proposed Thursday that the EU Digital Covid Certificate should be updated. This document has allowed people to travel more easily amid the pandemic by outlining their vaccination status, whether they have recently recovered from the virus, or whether they have recently tested negative.

The idea is that as immunity wanes, then a vaccine passport will expire.”

https://www.cnbc.com/2021/11/25/covid-travel-eu-proposes-a-9-month-expiration-date-on-vaccine-pass.html