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10 May 2021 This scientific brief replaces the WHO Scientific Brief entitled “’Immunity passports’ in the context of COVID-19”, published 24 April 2020. This update is focused on what is currently understood about SARS-CoV-2 immunity from natural infection. More information about considerations on vaccine certificates or “passports” will be covered in an update of WHO interim guidance, as requested by the COVID-19 emergency committee.

immunity,  COVID-19,  SARS-CoV-2,  vaccine certificate,