Issue 1 - December 30, 2018 - January 5, 2019 (week 1)
Influenza activity remained elevated 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 first week of January, influenza was circulating widely in Marin County, with elevated influenza-like illness activity (Figure 1).  Twenty four percent of samples tested were positive for influenza. (Figure 2). 
Influenza-like illness activity:  Influenza-like illness (ILI) activity began increasing during the week of December 16, 2018, and has remained elevated through the week of December 30, 2018 -- January 5, 2019.    See Figure 1 below.
Figure 1.  Proportion of Visits due to ILI:
Kaiser San Rafael, MGH, and NCH Emergency Departments and Sutter Terra Linda Urgent Care, 2016-17, 2017-2018, and 2018-2019 Influenza Seasons
Influenza testing: During week 1 (December 30 - January 5), 32 (24.2%) of the 132 specimens tested for influenza were positive. Of the positive specimens from week 52, 30 (93.8%) were influenza A and 2 (6.3%) were influenza B.  During this influenza season through January 5th, 96 specimens have tested positive for influenza.  See Figure 2 below.
Figure 2.  Influenza Tests in Marin County, 2018-19 Influenza Season
Visit for influenza vaccination, testing, and treatment recommendations.


Flu is circulating at elevated levels throughout California continued to increase during the week of December 30, 2018 - January 5, 2019. View full influenza updates at the California Department of Public Health's influenza surveillance update.  

United States

National influenza activity remains elevated.  View more detailed information at the Centers for Disease Control and Prevention's influenza surveillance website.
Copyright ©  2019
Marin County Department of Health and Human Services.
All rights reserved.

Karina Arámbula, MPH
(415) 473-2715

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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