Surveillance in public health is best described as which of the following?

• A. Periodic reporting of health topics to policymakers.
• B. A one-time survey of health behaviors.
• C. Systematic monitoring of the health status of a population through collection, analysis, and interpretation of health data in order to plan, implement, and evaluate PBH programs including determining the need for PBH action.
• D. Clinical diagnosis in individual patients.

Answer: (C)

Surveillance in public health is an ongoing, systematic process of collecting, analyzing, and interpreting data on the health status of a population so that actions to protect or improve health can be planned, implemented, and evaluated. This description fits because it emphasizes not just gathering data, but turning that data into timely, actionable information for decision-makers and for guiding public health programs. It also highlights the population focus and the use of data to determine the need for action and to assess the impact of interventions.

The other ideas are narrower: periodic reporting to policymakers misses the full data-collection and analysis cycle and the use of findings to trigger action; a one-time survey fails to capture trends over time or ongoing monitoring; clinical diagnosis in individuals is about patient care, not population-level surveillance.