Marin Influenza Surveillance

Marin Influenza Surveillance

Marin County Department of Health and Human Services tracks influenza activity by analyzing laboratory testing data and visits to local emergency departments for influenza-like illness.  Data is compared with influenza seasons from prior years to help predict burden of influenza across time.  The 2019-20 Influenza Season represents a more typical year; whereas the 2020-21 Influenza Season was impacted by shelter-in-place policies, sharply reducing influenza transmission.    You can find additional information about respiratory illness and COVID-19 in Marin County here.

Influenza Testing

Figure 1. Influenza Tests in Marin County, 2019-20, 2020-21, and 2021-22 Influenza Seasons


Influenza-like Illness Activity

Figure 2. Proportion of Visits due to ILI: Kaiser San Rafael, MarinHealth Medical Center, and Novato Community Hospital Emergency Departments, 2019-20, 2020-21, and 2021-22 Influenza Seasons




Influenza Related Deaths

There were no reportable influenza-related deaths  in Marin County during the 2021-22 flu season.

Note: Per Title 17 California Code of Regulations, influenza-related deaths among laboratory-confirmed cases  less than 18 years old must be reported to the California Department of Public Health.  



Visit the California Department of Public Health's influenza website here for more information.


United States

For national influenza data, visit the Center for Disease Control and Prevention's influenza surveillance website here.


Email Address:

Marin Surveillance Update Archive

Other Influenza Surveillance Resources

California Department of Public Health
Centers for Disease Control and Prevention
World Health Organization

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