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FluView : 2015-2016 Influenza Season ; Week 40 ending October 10, 2015
  • Published Date:
    October 16, 2015.
  • Language:
    English
Filetype[PDF - 538.51 KB]


Details:
  • Corporate Authors:
    National Center for Immunization and Respiratory Diseases (U.S.). Influenza Division.
  • Description:
    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, compiles, and analyzes information on influenza activity year-round in the United States and produces FluView, a weekly influenza surveillance report, and FluView Interactive. The U.S. influenza surveillance system provides information in five categories collected from nine data sources. This is the first report of the 2015-2016 influenza season, which began on October 4, 2015.

    The five categories and nine data components of CDC 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: National Center for Health Statistics (NCHS) Mortality Surveillance System, 122

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

    • Hospitalizations: Influenza Hospitalization Network (FluSurv-NET) including the Emerging

    • Infections Program (EIP) and three additional states;

    • Outpatient Illness Surveillance: U.S. Outpatient Influenza-like Illness Surveillance Network

    • (ILINet);

    • Geographic Spread of Influenza: State and territorial epidemiologists’ reports.

    An overview of the CDC influenza surveillance system, including methodology and detailed descriptions of each data component, is available at: http://www.cdc.gov/flu/weekly/overview.htm.

    Synopsis: During week 40 (October 4-10, 2015), influenza activity was low in the United States.

    • Viral Surveillance: The most frequently identified influenza virus type reported by public health laboratories in week 40 was influenza A viruses, with influenza A (H3) viruses predominating. The percentage of respiratory specimens testing positive for influenza in clinical laboratories is low.

    • Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and influenza (P&I) was below their system-specific epidemic threshold in both the NCHS Mortality Surveillance System and the 122 Cities Mortality Reporting System.

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

    • Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 1.2%, which is below the national baseline of 2.1%. All 10 regions reported ILI below region-specific baseline levels. Georgia experienced low ILI activity; Puerto Rico, New York City and 47 states experienced minimal ILI activity; and the District of Columbia and two states had insufficient data.

    • Geographic Spread of Influenza: The geographic spread of influenza in Guam was reported as widespread; one state reported regional activity; one state reported local activity; Puerto Rico and 27 states reported sporadic activity; the U.S. Virgin Islands and 21 states reported no influenza activity; and the District of Columbia did not report.

    External_F1540.pdf

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