Alcance
This document specifies a reference architecture for event-based syndromic surveillance systems for infectious diseases. The system reference architecture addresses architectural components including concepts, data sources, and outputs of syndromic surveillance system.From the perspective of the diagnostic process,[ REF Reference_ref_11 \r \h 11 08D0C9EA79F9BACE118C8200AA004BA90B0200000008000000110000005200650066006500720065006E00630065005F007200650066005F00310031000000] this document covers the processes from the symptom-onset stage to the health-behaviour stage, which is prior to the healthcare-encounter stage.Non-infectious health hazards, such as natural disasters, human-induced emergencies and chronic diseases, and their associated surveillance systems are beyond the scope of this document.