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Issue 3 - November 20-January 7 2017 
Influenza activity remained elevanted 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. 
The following is an expansion of an Influenza Surveillance Update Report that was released during the week of January 1, 2017.
During the first week of January, influenza was circulating in Marin County, with elevated influenza-like illness activity (Figure 1) and percent positive of influenza tests (Figure 2). 
Influenza-like illness activity:  Influenza-like illness activity began increasing during the week of December 4, 2016, and has remained elevated through the week of January 1, 2017.  Discharge data from Kaiser San Rafael, Marin General Hospital, and Novato Community Hospital emergency departments and visits to Sutter Terra Linda Urgent Care showed the percentage of visits associated with influenza-like illness (ILI) was 16.4% during the week of January 1, 2017.  See Figure 1 below.
Figure 1.  Proportion of Visits due to Influenza-Like Illness (ILI):
Kaiser San Rafael, MGH, and NCH Emergency Departments and Sutter Terra Linda Urgent Care, 2014-15, 2015-2016, and 2016-2017 Influenza Seasons
Influenza testing: During the week of January 1-7, 2017, 76 (28.8%) of the 264 specimens tested for influenza were positive.  All of the positive specimens from January 1-7 were influenza A. During this influenza season through January 7, 204 specimens have tested positive for influenza.  See Figure 2 below.
Figure 2.  Influenza Tests in Marin County, 2016-2017 Influenza Season
PROVISIONAL DATA, SUBJECT TO CHANGE.
Visit MarinFlu.org for influenza vaccination, testing, and treatment recommendations.

California

Influenza activity in California continued to increase during the week of January 1, 2017. View full influenza updates at the California Department of Public Health's influenza surveillance website.

United States

National influenza activity has increased. View more detailed information at the Centers for Disease Control and Prevention's influenza surveillance website.
Copyright ©  2017
Marin County Department of Health and Human Services.
All rights reserved.


Haylea Hannah, MSPH
Epidemiology Fellow
HHannah@marincounty.org
(415) 473-6020

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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