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FluView : 2015-2016 Influenza Season ; Week 40 ending October 10, 2015
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  • 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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