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Guidance on conducting vaccine effectiveness evaluations in the setting of new SARS-CoV-2 variants: Interim guidance, 22 July 2021.

im-covid-vacc-effectiveness-adddendum-e
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This publication is an updated Addendum to the Evaluation of COVID-19 vaccine effectiveness Interim Guidance 17 March 2021 published here: https://www.paho.org/en/documents/evaluation-covid-19-vaccine-effective…