County of Marin Health and Human Services

Influenza Surveillance Update, January 2019

Marin

Influenza-like illness activity has increased in Marin.  Few laboratory tests were positive in November and early December, however positive tests have increased since mid-December.

Influenza-like illness activity 

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) has increased to moderate levels in December and at expected levels for this time of year.  

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 5, 96 specimens have tested positive for influenza.  See Figure 1 below. 

 

Figure 1. Influenza Tests in Marin County, 2018-2019 Influenza Season

Visit MarinFlu.org for influenza vaccination, testing, and treatment recommendations.

California

The geographic spread of influenza activity in California is widespread during the week 1 (December 30 - January 5).
Outpatient influenza-like illness and hospitalizations were above expected levels.
Visit the California Department of Public Health’s influenza website for more information.  

United States

Influenza activity increased nationally during week 1 (December 30-January 5).
For additional national influenza data, visit the Center for Disease Control and Prevention's influenza surveillance website.

If you have any questions or comments please contact:
Lisa Santora, MD
Deputy Public 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.

Sources

California Department of Public Health. hhttps://www.cdph.ca.gov/Programs/CID/DCDC/CDPH%20Document%20Library/Immu... 01/11/2019.

Centers for Disease Control and Prevention. https://www.cdc.gov/flu/weekly/. Accessed 01/11/2019.

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