Describe the role of GIS in public health surveillance.

• A. Data storage only.
• B. Spatial analysis to identify disease clusters, risk factors by geography, and to plan targeted interventions and resource allocation.
• C. Replacing field surveys with maps.
• D. Only mapping weather data.

Answer: (B)

The essential idea is using geographic information to analyze health data in space. GIS in public health surveillance enables spatial analysis to identify where disease clusters occur, how risk factors vary by geography, and how to plan targeted interventions and allocate resources accordingly. By layering different data—case counts, population, environmental exposures, infrastructure, and socio-economic factors—GIS reveals patterns that aren’t obvious in a spreadsheet alone, such as neighborhoods with higher incidence, access-to-care barriers, or environmental links to illness. This supports outbreak detection, prioritizing screening and vaccination efforts, and guiding where to deploy personnel and supplies for the greatest impact. Data collection and quality remain crucial; GIS adds value by making those data spatially explicit and easier to act on, rather than replacing field surveys. It also goes beyond weather data to integrate diverse health-related information for a fuller surveillance picture.