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5 May 2017

Weekly #US #Influenza #Surveillance #Report - 2016-17 Season, Wk 17 ending Apr 29 ‘17 (@CDCgov, summary)


Title: Weekly #US #Influenza #Surveillance #Report - 2016-17 Season, Wk 17 ending Apr 29 ‘17.

Subject: Human Influenza Viruses, seasonal winter epidemic, current situation in the US.

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

Code: [     ]


Weekly U.S. Influenza Surveillance Report - 2016-2017 Influenza Season Week 17 ending April 29, 2017


Language: [ English (US) | Español ]


|-- Full report also available as PDF –|


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



    • During week 17 (April 23-29, 2017), influenza activity decreased in the United States.
  • Viral Surveillance:
    • The most frequently identified influenza virus type reported by public health laboratories during week 17 was influenza B.
    • The percentage of respiratory specimens testing positive for influenza in clinical laboratories decreased.
  • Novel Influenza A Virus
    • One human infection with a novel influenza A virus was reported.
  • 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:
    • Ten influenza-associated pediatric deaths were reported, seven that occurred during the 2016-2017 season and three that occurred during the 2015-2016 season.
  • Influenza-associated Hospitalizations:
    • A cumulative rate for the season of 63.8 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 1.4%, which is below the national baseline of 2.2%.
    • All ten regions reported ILI below their region-specific baseline levels.
    • Four states experienced low ILI activity; New York City, Puerto Rico, and 46 states experienced minimal ILI activity; and the District of Columbia had insufficient data.
  • Geographic Spread of Influenza:
    • The geographic spread of influenza in three states was reported as widespread; Guam and eight states reported regional activity; the District of Columbia, Puerto Rico, and 20 states reported local activity; 19 states reported sporadic activity; and the U.S. Virgin Islands reported no activity.



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