FluView : 2012-2013 Influenza Season ; Week 40 ending October 6, 2012
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FluView : 2012-2013 Influenza Season ; Week 40 ending October 6, 2012

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    All data are preliminary and may change as more reports are received.

    Background: The Centers for Disease Control and Prevention’s (CDC) Influenza Division collects and analyzes influenza surveillance data year-round and produces a weekly report on U.S. influenza activity during the influenza season which begins at week 40 each year. The U.S. influenza surveillance system provides information in five categories collected from eight data sources. This is the first report of the 2012-2013 influenza season, which began on September 30, 2012, and also summarizes influenza activity during the summer weeks of the 2011-12 season.

    The five categories of influenza surveillance are:

    • Viral Surveillance: U.S. World Health Organization (WHO) collaborating laboratories, the National Respiratory and Enteric Virus Surveillance System (NREVSS), and human infection with novel influenza A virus case reporting;

    • Mortality: 122 Cities Mortality Reporting System and influenza-associated pediatric deaths;

    • Hospitalizations: Influenza Hospitalization Network (FluSurv-NET) including the Emerging Infections Program (EIP),

    • Outpatient Illness Surveillance: U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet);

    • Summary of geographic spread of influenza: state and territorial epidemiologists’ reports.An overview of surveillance methods is available at: http://www.cdc.gov/flu/weekly/overview.htm

    Synopsis: During week 40 (September 30-October 6, 2012), influenza activity was low in the United States.

    o Viral Surveillance: Of 2,870 specimens tested and reported by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories during week 40, 75 (2.6%) were positive for influenza.

    o Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and influenza (P&I) was below the epidemic threshold.

    o Influenza-associated Pediatric Deaths: No influenza-associated pediatric deaths were reported.

    o Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 1.2%, which is below the national baseline of 2.2%. All 10 regions reported ILI below region-specific baseline levels. Forty-seven states and New York City experienced minimal ILI activity and the District of Columbia and three states had insufficient data.

    o Geographic Spread of Influenza: The geographic spread of influenza in one state

    (Wyoming) was reported as local; the District of Columbia and 29 states reported sporadic activity; Guam and 18 states reported no influenza activity, and Puerto Rico, the U.S. Virgin Islands, and two states did not report.

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