McHenry County Department of Health
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Flu Surveillance

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McHenry County Department of Health (MCDH) provides comprehensive population, health behavior, and disease surveillance data for residents of McHenry County. This page contains influenza (flu) surveillance data and reports only. For other types of data and reports, please click here. For more information on influenza and influenza surveillance, please see the additional links below.

Influenza Surveillance

McHenry County Department of Health (MCDH) tracks seasonal influenza using influenza-like illness (ILI) surveillance reports (ILI 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). Influenza-associated intensive care unit (ICU) admissions; influenza-associated pediatric deaths; Influenza A, novel virus cases; and influenza outbreaks in long-term care facilities (LTCF) are reported to MCDH Communicable Disease staff. Hospital Emergency Room (ER) chief complaints (of fever and cough, fever and sore throat, or influenza) are tracked automatically through Electronic Surveillance System for the Early Notification of Community-based Epidemics (ESSENCE). School absenteeism due to ILI are reported weekly to MCDH via an electronic form. Flu surveillance is conducted from MMWR Week 40 - Week 20 (approximately the first week in October to the end of the third week in May). All data are provisional and may change as more reports are received. MCDH thanks all of our surveillance partners for their help in collecting this information.