Issue 3 - March 31, 2019 - April 6, 2019 
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 first week of April, 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 remains elevated in Marin County. Flu activity remains above expected levels for this time of year. Discharge data from Kaiser San Rafael, Marin General Hospital, and Novato Community Hospital emergency departments showed the percentage of visits associated with influenza-like illness (ILI) was 7.49% during week 14 (March 31 - April 6). See Figure 1 below. 
Figure 1.  Proportion of Visits due to Influenza-Like Illness (ILI):
Kaiser San Rafael, MGH, and NCH Emergency Departments, 2016-17, 2017-2018, and 2018-2019 Influenza Seasons
Influenza testing: During week 14 (March 31 - April 6), 41 (28.7%) of the 143 specimens tested for influenza were positive.  Of the positive specimens from week 14, 40 (97.6%) were influenza A and 1 (2.4%) were influenza B. During this influenza season through April 6, 467 specimens have tested positive for influenza.  See Figure 2 below. 
Figure 2.  Influenza Tests in Marin County, 2018-2019 Influenza Season
Visit for influenza vaccination, testing, and treatment recommendations.


Influenza activity in California continued to increase during the week of March 31 - April 6. 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 ©  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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