McHenry County Department of Health
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Flu Surveillance

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Flu Vaccination Recommendations

The CDC has announced its vaccination recommendations for the 2018 - 2019 flu season. The CDC recommends yearly flu vaccination for people 6 months and older. For more information on the 2018 - 2019 flu vaccination recommendations, click here.

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.

2018 - 2019

2017 - 2018

2016 - 2017

 2015 - 2016

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