Which statement best describes the purpose of public health surveillance?

• A. To document patient satisfaction with care.
• B. To determine hospital reimbursement rates.
• C. To identify population health patterns and trigger rapid investigation and response.
• D. To predict stock market trends.

Answer: (C)

Public health surveillance is about continuously collecting and analyzing health data from a population to spot patterns, trends, and unusual events, so that health authorities can trigger rapid investigations and responses to protect the public. This focus on identifying population-level patterns and acting quickly to contain or prevent harm is what makes the statement describing surveillance's purpose the best fit. Documenting patient satisfaction relates to quality of care and service experience, not monitoring disease patterns across a population. Determining hospital reimbursement rates is an administrative/financial task. Predicting stock market trends is outside the realm of public health.