A clinical case definition of post COVID-19 condition by a Delphi consensus, 6 October 2021 31 December 2021 | Report Download (890.7 kB) WHO Team WHO Headquarters (HQ) Editors World Health Organization Number of pages 20 Reference numbers WHO Reference Number: WHO/2019-nCoV/Post_COVID-19_condition/Clinical_case_definition/2021.1 Copyright