Which Is an Example of Passive Surveillance

Which is an example of passive surveillance?

A) A family doctor reporting a positive case of West Nile virus to a local health authority
B) Sentinel systems to identify disease occurrence in the community when individuals present with suggestive symptoms
C) The Influenza-Like Illness (ILI) screening tool used in emergency rooms
D) Absenteeism data related to influenza from all schools in the community

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