FluView: 2017–2018 Influenza Season: Week 16 ending April 21, 2018

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.
  
  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.
  
  
• Subjects:
  Disease Outbreaks Influenza, Human/epidemiology Public Health Surveillance
• Series:
  FluView
• Document Type:
  Text
• Genre:
  Newsletter ; Statistics
• Place as Subject:
  United States
• Pages in Document:
  17 numbered pages
• Volume:
  2017
• Issue:
  21
• Collection(s):
  Stephen B. Thacker CDC Library
• Main Document Checksum:
  urn:sha-512:be643acbe4691c69da2398a367eee71c567802e6847460d97a18e4ffca18c05b61b34f019500b6fae0fc954326e70b785a449c3fd1bff1cdf0a95d1267175849
• Download URL:
  https://stacks.cdc.gov/view/cdc/53645/cdc_53645_DS1.pdf
• File Type:
  [PDF - 727.98 KB ]