Syndromic Surveillance:
· Detects outbreaks earlier and with greater sensitivity than diagnosis-based surveillance.
· Is usually based on chief complaints, clinical signs, and laboratory findings
· May include non-patient indications & warnings before diagnosis (e.g., absences from work or school, frequency and pattern of phone calls from healthcare providers, ambient temperature, etc)
· Signals a sufficient probability of an outbreak
· Warrants further public health response or investigation