Which statement best describes sentinel surveillance sites in field PM operations?

• A. It represents national data
• B. It follows every individual in the population
• C. A selected subset of locations that provide high-quality, timely data; used to detect signals, monitor trends, and guide targeted interventions; not intended to represent national data alone.
• D. It replaces laboratory confirmation

Answer: (C)

Sentinel surveillance relies on a few carefully chosen sites to collect data quickly and consistently, focusing on signals, trends, and actionable interventions rather than trying to count every case across the whole country. These sites provide high-quality, timely data that can reveal rising trends or outbreak signals and help target interventions where they’ll have the most impact. They are not intended to represent national data by themselves; they’re a sample designed to monitor patterns in specific areas or populations. Lab confirmation remains essential and is not replaced by sentinel data, which serves to detect signals and guide response in field operations, especially when resources are limited.