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Influenza-like illness activity:  Influenza-like illness activity in Marin County from November 24-December 7 was low.  Discharge data from Kaiser San Rafael, Marin General Hospital, and Novato Community Hospital emergency departments and visits to the Sutter Terra Linda Urgent Care Center showed the percentage of visits associated with influenza-like illness (ILI) increased to 0.84% during week 48 (November 24-30, 2013) and decreased to 0.56% in week 49 (December 1-7).  See Figure 1 below.

Influenza-like illness activity:  Influenza-like illness activity in Marin County from November 10-23 was minimal.  Discharge data from Kaiser San Rafael, Marin General Hospital, and Novato Community Hospital emergency departments and visits to the Sutter Terra Linda Urgent Care Center showed the percentage of visits associated with influenza-like illness (ILI) decreased to 0.23% during week 46 (November 10-16, 2013) and 0.17% in week 47 (November 17-23).  See Figure 1 below.

Influenza-like illness activity:  Influenza-like illness activity in Marin County from October 27 - November 9 was low.  Discharge data from Kaiser San Rafael, Marin General Hospital, and Novato Community Hospital emergency departments and visits to the Sutter Terra Linda Urgent Care Center showed the percentage of visits associated with influenza-like illness (ILI) was 0.43% during week 44 (October 27-November 2, 2013), then increased to 0.68% in week 45 (November 3-9).  See Figure 1 below.

Influenza-like illness activity:

• Influenza-like illness activity in Marin County from October 13-26 was minimal.  Discharge data from Kaiser San Rafael, Marin General Hospital, and Novato Community Hospital emergency departments and visits to the Sutter Terra Linda Urgent Care Center during week 42 (October 13-19, 2013) showed the percentage of visits associated with influenza-like illness (ILI) decreased to 0.28%, then increased to 0.51% in week 43 (October 20-26).  See Figure 1 below.

This is the first Influenza Surveillance Update of the 2013-2014 influenza season.  The report will be prepared bi-weekly until influenza activity begins to increase, then the report will be prepared weekly.

Influenza-like illness activity: