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25 May 2018

Weekly #US #Influenza #Surveillance #Report - 2017-18 Season, Wk 20 ending May 19, 2018 (@CDCgov, FluView, summary)



Weekly #US #Influenza #Surveillance #Report - 2017-18 Season, Wk 20 ending May 19, 2018.


Human Influenza Viruses, A (H1, H3) & B subtypes, current epidemiological situation in the US.


US Centers for Disease Control and Prevention (CDC), FluView, full page: (LINK). Summary, edited.


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Weekly U.S. Influenza Surveillance Report - 2017-2018 Influenza Season Week 20 ending May 19, 2018


Language: [ English (US) | EspaƱol ]


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


    • During week 20 (May 13-19, 2018), influenza activity continued to decrease 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:
    • One influenza-associated pediatric death was reported.
  • Influenza-associated Hospitalizations:
    • A cumulative rate of 106.6 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 1.2%, which is below the national baseline of 2.2%.
    • All 10 regions reported ILI below region-specific baseline levels.
    • New York City, the District of Columbia, Puerto Rico and all 50 states experienced minimal ILI activity.
  • Geographic Spread of Influenza:
    • The geographic spread of influenza in one state was reported as widespread; Guam, Puerto Rico and one state reported regional activity; seven states reported local activity; the District of Columbia, the U.S. Virgin Islands and 37 states reported sporadic activity; and four states reported no influenza activity.



Keywords: US CDC; USA; Updates; Seasonal Influenza.


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