McHenry County Department of Health (MCDH) provides comprehensive population, health behavior, and disease surveillance data for residents of McHenry County. This page contains all MCDH data and reports.
Disease Surveillance Updates
2018 - 2019 Influenza Season
Influenza-like illness (ILI) activity in McHenry County is currently estimated to be moderate (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.