Issue 3 - October 1, 2017 - March 10, 2018 
Influenza activity in Marin County
The Marin County Department of Health and Human Services conducts local influenza surveillance during flu season each year and offers periodic updates to you, our healthcare providers. 
During the tenth week of 2018, influenza activity has decreased but remains elevated.   
Influenza-like illness activity:  Influenza-like illness activity has decreased since last month.  Discharge data from Kaiser San Rafael, Marin General Hospital, and Novato Community Hospital emergency departments and showed the percentage of visits associated with influenza-like illness (ILI) was 6.9% during the week of March 4-10, 2018.  See Figure 1 below.
Figure 1.  Proportion of Visits due to Influenza-Like Illness (ILI):
Kaiser San Rafael, MGH, and NCH Emergency Departments , 2015-16, 2016-2017, and 2017-2018 Influenza Seasons
Influenza testing: During week 10 (March 4-10), 32 (20.9%) of the 153 specimens tested for influenza were positive.  Of the positive specimens from week 10, 4 (12.5%) were influenza A and 28 (87.5%) were influenza B.  During this influenza season through  March 4, 644 specimens have tested positive for influenza.  See Figure 2 below.
Figure 2.  Influenza Tests in Marin County, 2017-2018 Influenza Season
Visit for influenza vaccination, testing, and treatment recommendations.


Influenza activity is decreasing but remains above expected levels throughout California.during the week of March 4-10, 2018. Visit the California Department of Public Health’s influenza website for more information. 

United States

National influenza activity has increased during week 10 (March 4-10, 2018).  View more detailed information at the Centers for Disease Control and Prevention's influenza surveillance website.
Copyright ©  2018
Marin County Department of Health and Human Services.
All rights reserved.

Lisa Santora, MD, MPH
Deputy Health Officer
(415) 473-4163

This publication is provided to you by the Office of the Public Health Officer, County of Marin Department of Health and Human Services.

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