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Situation Update: Summary of Weekly FluView Report

FluView Activity Update (Key Flu Indicators)

According to this week’s FluView report, seasonal influenza activity is low overall across the United States. Five states reported local influenza activity and 38 states reported sporadic influenza activity. Flu vaccine is the best available way to protect against influenza. CDC recommends that everyone 6 months and older get an injectable flu vaccine before the end of October, if possible. Below is a summary of the key flu indicators for the week ending October 14, 2017:

  • Influenza-like Illness Surveillance: For the week ending October 14, the proportion of people seeing their health care provider for influenza-like illness (ILI) was 1.3% and is below the national baseline of 2.2%. All 10 regions reported a proportion of outpatient visits for ILI below their region-specific baseline levels. Additional ILINet data, including national, regional, and select state-level data for the current and previous seasons, can be found at
  • Influenza-like Illness State Activity Indicator Map: New York City, the District of Columbia, Puerto Rico and all 50 states experienced minimal ILI activity. Additional data, including data for previous seasons, can be found at
  • Geographic Spread of Influenza Viruses: Regional influenza activity was reported by Guam. Local influenza activity was reported by 5 states (California, Colorado, Massachusetts, Oklahoma and South Carolina). Sporadic activity was reported by the U.S. Virgin Islands and 38 states (Alaska, Arizona, Arkansas, Connecticut, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kentucky, Louisiana, Maine, Maryland, Michigan, Minnesota, Mississippi, Missouri, Montana, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oregon, Pennsylvania, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, Wisconsin, and Wyoming). No influenza activity was reported by the District of Columbia and 7 states (Alabama, Delaware, Kansas, Nebraska, Nevada, Rhode Island and West Virginia). Puerto Rico did not report. Geographic spread data show how many areas within a state or territory are seeing flu activity. Additional data are available at:
  • Flu-Associated Hospitalizations:
  • Mortality Surveillance:
    • The proportion of deaths attributed to pneumonia and influenza (P&I) was 5.3% for the week ending September 30, 2017 (week 39). This percentage is below the epidemic threshold of 6.0% for week 39 in the National Center for Health Statistics (NCHS) Mortality Surveillance System.
    • Region and state-specific data are available at http//
  • Pediatric Deaths:
    • One influenza-associated pediatric death that occurred during the past 2016-2017 flu season was reported to CDC during week 41.
      • This death was associated with an influenza B virus and occurred during week 14 (the week ending April 8, 2017). This death brings the total number of reported influenza-associated pediatric deaths occurring during that season to 108.
    • No influenza-associated pediatric deaths have been reported to CDC for the 2017-2018 season.
    • Additional information on pediatric deaths is available on FluView Interactive at:
  • Laboratory Data:
    • Nationally, the percentage of respiratory specimens testing positive for influenza viruses in clinical laboratories during the week ending October 14 was 2.2%.
    • Regionally, the three week average percent of specimens testing positive for influenza in clinical laboratories ranged from 0.6% to 5.0%.
    • During the week ending October 14, of the 270 (2.2%) influenza-positive tests reported to CDC by clinical laboratories, 185 (68.5%) were influenza A viruses and 85 (31.5%) were influenza B viruses.
    • The most frequently identified influenza virus type reported by public health laboratories was influenza A virus.
    • During the week ending October 14, 82 (85.4%) of the 96 influenza-positive tests reported to CDC by public health laboratories were influenza A viruses and 10 (14.6%) were influenza B viruses. Of the 70 influenza A viruses that were subtyped, 67 (95.7%) were H3N2 viruses and 3 (4.3%) were (H1N1)pdm09 viruses.
    • The majority of the influenza viruses collected from the United States during May 21 through October 14, 2017 were characterized antigenically and genetically as being similar to the cell-grown reference viruses representing the 2017–18 Northern Hemisphere influenza vaccine viruses.
    • None of the viruses tested from May 21-October 14, 2017 at were found to be resistant to oseltamivir, zanamivir, or peramivir.

FluView is available – and past issues are archived – on the CDC website.

Note: Delays in reporting may mean that data changes over time. The most up to date data for all weeks during the 2017-2018 season can be found on the current FluView and FluView Interactive.