Revised COVID-19 case definitions


WHO has published revised interim guidance on public health surveillance for COVID-19 cases. This document includes revision of suspected and probable case definitions to integrate increased knowledge on the clinical spectrum of COVID-19 signs and symptoms.

WHO has published revised interim guidance on public health surveillance for COVID-19 cases. This document provides guidance to Member States on the implementation of surveillance for COVID-19 and the reporting requirements for WHO.

What is new in this revised version:

  • revision of suspected and probable case definitions to integrate increased knowledge on the clinical spectrum of COVID19 signs and symptoms;
  • updated approaches to surveillance, including environmental and serological surveillance for SARS-CoV-2;
  • revision of variables included in weekly surveillance to fit with new case definitions and surveillance objectives (that is, inclusion of probable cases, health-care worker cases and updated age groups for reporting cases and deaths);
  • information on the importance of the collection of metadata for analysis and interpretation of surveillance data;
  • recommendations for ending case-based reporting for global surveillance and replacing it with aggregate reporting.
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