In medicine and clinical care, it is common to periodically perform tests to measure a patient’s health. A physician might perform a weekly blood pressure measurement, an annual cholesterol level test, an annual exam to determine vision status and eye health, and frequent “well-baby” checks. In public health, where the “patient” is a group, community, or population of people, such a periodic assessment of health status or factors contributing to health and disease is called disease surveillance or risk factor surveillance.
As with a physician using patient tests in a clinical setting, the goal of the public health practitioner using disease
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