Which element concerns describing and monitoring health events through ongoing and systemic collection, analysis, and interpretation of health data?

• A. Surveillance
• B. Evaluation
• C. Intervention
• D. Assessment

Answer: (A)

Surveillance describes and monitors health events through ongoing, systematic collection, analysis, and interpretation of health data, with findings shared to those who can act. This continuous loop—gathering data, analyzing trends, interpreting what they mean, and disseminating results—lets public health officials detect outbreaks early, track disease patterns over time, and gauge the impact of interventions. For example, tracking cases of a reportable illness or monitoring influenza-like illness through sentinel systems are part of surveillance. In contrast, evaluation focuses on judging the effectiveness of a program after it’s in place, assessment is about determining health needs and current status, and intervention refers to the actions taken to prevent or control health problems.