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*epidemic limited to localised increase in the incidence of disease
*[https://www.cdc.gov/csels/dsepd/ss1978/lesson1/section11.html Epidemic Disease Occurrence - Level of disease]
==what to do when to investigate an outbreak==
*[https://www.cdc.gov/csels/dsepd/ss1978/lesson6/section2.html Steps of an Outbreak Investigation]
# Prepare for field work
# Establish the existence of an outbreak
# Verify the diagnosis
# Construct a working case definition
# Find cases systematically and record information
# Perform descriptive epidemiology
# Develop hypotheses
# Evaluate hypotheses epidemiologically
# As necessary, reconsider, refine, and re-evaluate hypotheses
# Compare and reconcile with laboratory and/or environmental studies
# Implement control and prevention measures
# Initiate or maintain surveillance
# Communicate findings
