Public Health Surveillance

**Definition:** The ongoing, systematic collection, analysis, and interpretation of health-related data with the purpose of preventing or controlling disease or injury, or of identifying unusual events of public health importance, followed by the dissemination and use of information for public health action. (From Am J Prev Med 2011;41(6):636)

**Tree numbers:** - E05.318.308.980.438.700.324 - N05.715.360.300.800.438.625.324 - N06.850.520.308.980.438.700.324 - N06.850.780.675.487