The WHO case definition has been used consistently since January 2020, with the updated WHO case definition used from the 27 February and 20 March.
Probable cases are defined as people with symptoms from high-risk areas or contacts of confirmed cases. Contacts are defined as people who were in contact with confirmed case within the last 14 days.
Contract tracing is carried out for all primary contacts and their families and/or people they live with.
Respiratory disease surveillance system and the WHO global COVID-19 surveillance system are used for surveillance of COVID-19. Surveillance covers affected areas and information on local/community transmission.