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FluView : 2017-2018 influenza season week 16 ending April 21, 2018
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Details:
  • Description:
    Disease Outbreaks

    Influenza, Human/epidemiology

    Public Health Surveillance

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

    During week 15 (April 8-14, 2018), influenza activity decreased in the United States.

    During week 16 (April 15-21, 2018), influenza activity decreased in the United States.

    • Viral Surveillance: Overall, influenza A(H3) viruses have predominated this season. Since early March, influenza B viruses have been more frequently reported than influenza A viruses. The percentage of respiratory specimens testing positive for influenza in clinical laboratories decreased.

    • Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and influenza (P&I) was below the system-specific epidemic threshold in the National Center for Health Statistics (NCHS) Mortality Surveillance System.

    • Influenza-associated Pediatric Deaths: Four influenza-associated pediatric deaths were reported.

    • Influenza-associated Hospitalizations: A cumulative rate of 105.3 laboratory-confirmed influenza-associated hospitalizations per 100,000 population was reported.

    • Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 1.7%, which is below the national baseline of 2.2%. One of 10 regions reported ILI at or above their region-specific baseline level. Three states experienced low ILI activity; and New York City, the District of Columbia, Puerto Rico, and 47 states experienced minimal ILI activity.

    • Geographic Spread of Influenza: The geographic spread of influenza in four states was reported as widespread; Guam, Puerto Rico and nine states reported regional activity; 25 states reported local activity; the District of Columbia, the U.S. Virgin Islands and 10 states reported sporadic activity; and two states reported no influenza activity.

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