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A systematic collection, analysis, interpretation, and dissemination of health data for the monitoring and control of diseases.

An approach to surveillance where health department staff, others, collect data on symptoms before diagnoses are made for early detection of outbreaks.

The resistance to the spread of a contagious disease within a population that results if a sufficiently high proportion of individuals are immune to the disease.

The time between exposure to a pathogen and the onset of symptoms.

The expected number of cases directly generated by one case in a population where all individuals are susceptible to infection.

The separation of people who have a contagious disease from those who are not sick.

Methods used to eliminate or control the spread of disease through vectors such as mosquitoes, ticks, or other animals.

The separation and restriction of movement of people who may have been exposed to a contagious disease to see if they become sick.

The process of identifying, assessing, and managing people who have been exposed to a contagious disease to prevent onward transmission.

A systematic method to find the source and cause of an outbreak, establish how to control and prevent it, and take action

The proportion of individuals diagnosed with a disease who die from that disease in a specified time period.

An epidemic that has spread over multiple countries or continents, usually affecting a large number of people.

The process of informing people about potential health threats and the measures needed to protect themselves, their families, and their communities.