Issue 2 - November 20-December 31 2016 - Weeks 47-52
Influenza activity is increasing 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. 
As expected each season, influenza activity has started to increase in the Bay Area.  This week, there have been coordinated county press releases in the region about local influenza activity.  The following is a partial Influenza Surveillance Update Report with up-to-date information about recent influenza trends in Marin County.  A full Influenza Surveillance Update Report will be released on next week (during the week of January 9th).  

Use of the Rapid Influenza Diagnostic Test

Rapid Influenza Diagnostic Tests can be falsely negative when the prevalence of influenza is high, as it currently is in Marin County.  The California Department of Public Health advises that these tests should not be used for making treatment decisions in persons at higher risk for influenza complications.  Real-time PCR is the preferred laboratory testing method when influenza infection is suspected.  
Local influenza activity began increasing during the week of December 11th, with a substantial increase in positive influenza tests during the last week of December (December 25 - 31, 2016) (Figure 1). 
Influenza testing: During the week of December 25-31, 2016, 70 (34.8%) of the 201 specimens tested for influenza were positive.  Of the positive specimens from December 25-31, 69 (99%) were influenza A and 1 (1%) was influenza B. During this influenza season through December 31, 128 specimens have tested positive for influenza.  See Figure 1 below.
Figure 1.  Influenza Tests in Marin County, 2016-2017 Influenza Season
Visit for influenza vaccination, testing, and treatment recommendations.


The geographic spread of influenza activity in California increased to widespread. 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
(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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