McHenry County Department of Health
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Health Statistics and Epidemiology

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Epidemiology is the study of the distribution of disease and factors affecting the health of populations with the goal of preventing disease and promoting health. At McHenry County, the epidemiologist’s primary role is to conduct disease surveillance, investigate and describe disease outbreaks, analyze data to determine risk factors for adverse health outcomes, and plan for and respond to public health emergencies.



2018 - 2019 Influenza Season Updates

The CDC recommends yearly flu vaccination for people 6 months and older. Get more information on the 2018 - 2019 flu vaccination recommendations.

Influenza-like illness (ILI) activity in McHenry County is currently estimated to be low (ILI is used to estimate influenza activity and is defined as a fever ≥ 100°F AND new onset of cough and/or sore throat in the absence of a known cause other than influenza). To see the latest McHenry County flu surveillance report, as well as links to the Illinois Department of Public Health (IDPH) and Centers for Disease Control and Prevention (CDC) influenza surveillance, please click on the "Flu Surveillance" icon above.