FluView: Weekly U.S. Influenza Surveillance Report: 2018–2019 Influenza Season Week 46 ending November 17, 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.
  
  Synopsis: Influenza activity in the United States remains low, although small increases in activity were reported. Influenza A(H1N1)pdm09, influenza A(H3N2), and influenza B viruses continue to co-circulate, with influenza A(H1N1)pdm09 viruses reported most commonly by public health laboratories since September 30, 2018. Below is a summary of the key influenza indicators for the week ending November 17, 2018:
  
  • Viral Surveillance: Influenza A viruses have predominated in the United States since the beginning of July. The percentage of respiratory specimens testing positive for influenza in clinical laboratories was low.
  
  o Virus Characterization:The majority of influenza viruses characterized antigenically and genetically are similar to the cell-grown reference viruses representing the 2018–2019 Northern Hemisphere influenza vaccine viruses.
  
  o Antiviral Resistance:All viruses tested since late May show susceptibility to the antiviral drugs oseltamivir, zanamivir, and peramivir.
  
  • Influenza-like Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) increased slightly to 1.9%, which is below the national baseline of 2.2%. One of 10 regions reported ILI at or above their region-specific baseline level.
  
  • ILI State Activity Indictor Map: One state experienced moderate ILI activity, three states experienced low ILI activity; and New York City, the District of Columbia, Puerto Rico and 39states experienced minimal ILI activity.
  
  • Geographic Spread of Influenza: The geographic spread of influenza in one state was reported as regional; Guam and 14 states reported local activity; and the District of Columbia, Puerto Rico, the U.S. Virgin Islands and 35 states reported sporadic activity.
  
  • 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: No influenza-associated pediatric deaths were reported to CDC for week 46.
  
  
• Subjects:
  Disease Outbreaks Influenza, Human/epidemiology Public Health Surveillance
• Series:
  FluView
• Document Type:
  Text
• Genre:
  Newsletter ; Statistics
• Place as Subject:
  United States
• Volume:
  2017
• Issue:
  46
• Collection(s):
  Stephen B. Thacker CDC Library
• Main Document Checksum:
  urn:sha-512:137c001f63917ad1ec35fd6fa737a8d188762a9af0da92410328e93603a3351fbf28a62ea1371ee851604177a616fd2709a14ea1806b709b9e6598a76cc5e6a5
• Download URL:
  https://stacks.cdc.gov/view/cdc/60891/cdc_60891_DS1.pdf
• File Type:
  [PDF - 550.63 KB ]