Surveillance is used to monitor disease at a what level?

• A. Community-level
• B. Population-level
• C. Individual-level
• D. Household-level

Answer: (B)

Surveillance aims to track disease patterns across groups to understand how illness affects people as a whole. It gathers data from many cases to estimate how common a disease is, where it occurs, and how trends change over time. That broad, population-level view is what lets public health officials detect outbreaks early, monitor shifts in transmission, and evaluate the impact of interventions. Focusing on a single person wouldn’t provide the overall picture surveillance seeks; looking only at households narrows the view and may miss wider trends, while a community-level angle is related but the standard framework describes it in terms of population-level surveillance to capture information about the health of a defined population as a whole.