Which discipline is primarily used to track disease trends and measure health interventions' impact?

• A. Pathology
• B. Epidemiology
• C. Pharmacology
• D. Immunology

Answer: (B)

Tracking disease trends and measuring how health interventions affect populations is the work of epidemiology. This field focuses on who gets sick, where and when, and why, using data from surveillance systems, health records, and surveys to observe patterns over time. It quantifies disease frequency with measures like incidence and prevalence and compares groups to see whether interventions—such as vaccination campaigns or sanitation programs—change outcomes. This population-based perspective helps CHWs and health programs determine where to target resources and whether programs are making a real difference.

Pathology, by contrast, looks at disease at the tissue and cellular level to diagnose conditions in individuals. Pharmacology studies how drugs work and their effects, while immunology examines the immune system and its responses. None of those center on tracking trends across populations or evaluating program impact in the way epidemiology does.