Figure 1.

Categorisation of COVID-19 Public Health Intelligence activities, as of December 2021^a

^a These are the types and subtypes of categories detected by the Global team within the WHO headquarters COVID-19 Incident Management Support Team, and do not represent all types of PHI information detected by WHO. The scope of signals is adapted based on the evolution of the pandemic, and additional signal types may be monitored and detected based on surveillance and response needs.