These data contain outpatient influenza-like illness surveillance data from volunteer sentinel providers by region and influenza season.

Outpatient Influenza-like Illness Surveillance Data by Region and Influenza Season

Influenza Surveillance

2009-2010, 2010-2011, 2011-2012, 2012-2013, 2013-2014, 2014-2015, 2015-2016, 2016-2017, 2017-2018.

Centers for Disease Control and Prevention (CDC) Morbidity and Mortality Report (MMWR) Week. Format is YYYYWW. Weeks begin on Sunday and end on Saturday.

Date_code

Date of the last day included in the CDC MMWR Week (Saturday). Format MM/DD/YYYY.

Weekending

Region

Bay Area:  Includes Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Santa Cruz, Solano, and Sonoma counties

Central: Includes Calaveras, Fresno, Inyo, Kings, Madera, Mariposa, Merced, Mono, Monterey, San Benito, San Joaquin, Stanislaus, Tulare, and Tuolumne counties

Lower Southern: Includes Imperial, Orange, Riverside, San Bernardino, and San Diego counties

Northern: Includes Alpine, Amador, Butte, Colusa, Del Norte, El Dorado, Glenn, Humboldt, Lake, Lassen, Mendocino, Modoc, Nevada, Placer, Plumas, Sacramento, Shasta, Sierra, Siskiyou, Sutter, Tehama, Trinity, Yolo, and Yuba counties

Upper Southern: Includes Kern, Los Angeles, San Luis Obispo, Santa Barbara, and Ventura counties

Note: Not all counties in region have public health laboratories.

Influenza_Category

Influenza_A: Total number of specimens positive for Influenza virus, type A (all subtypes)

Influenza_AH3: Total number of specimens positive for Influenza virus, type A, subtype (H3N2)

Influenza_AH1: Total number of specimens positive for Influenza virus, type A, subtype (H1N1), the influenza A (H1N1) virus that circulated prior to the 2009 influenza pandemic.

Influenza_AH1pdm09: Total number of specimens positive for Influenza virus, type A, subtype (H1N1)pdm09, the influenza A (H1N1) virus that emerged during the 2009 influenza pandemic.

Influenza_ANotSubtyped: Total number of specimens positive for Influenza virus, type A, for which subtyping was not attempted or not possible. Reasons subtyping might not have been possible include the detection of a novel, pandemic, or variant influenza virus (such as during the 2009 influenza pandemic) or specimens that did not have enough influenza virus present to allow for complete subtyping.

Influenza_B: Total number of specimens positive for Influenza virus, type B (all lineage types)

Influenza_BVictoria: Total number of specimens positive for Influenza virus, type B, Victoria lineage

Influenza_BYamagata: Total number of specimens positive for Influenza virus, type B, Yamagata lineage

Influenza_BNotLineageTyped: Total number of specimens positive for Influenza virus, type B, for which lineage typing was not attempted

Influenza_Total: Total number of specimens positive for influenza, all types 

Influenza_Tested: Total number of specimens tested for Influenza virus 

Influenza virus, type A (H1N1), the influenza A (H1N1) virus that circulated prior to the 2009 influenza pandemic, no longer circulated after the 2009-2010 influenza season.

Influenza B lineage typing information is only available during the 2014-2015 influenza season through present. 

Number of specimens meeting the criteria listed in the Influenza_Category field

Count

There was one influenza B Victoria and influenza B Yamagata coinfection included in the week 201444 counts for the Lower Southern region and California.

Outpatient Influenza-like Illness Surveillance Data by Region and Influenza Season

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Outpatient Influenza-like Illness Surveillance Data by Region and Influenza Season

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