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Situation Update: Summary of Weekly FluView

Key Flu Indicators

According to this week’s FluView report, overall seasonal influenza activity remains low across the United States, though an increase in influenza activity is likely in the coming weeks. People who have not already gotten a flu vaccine for the 2014-2015 season should do so now. Below is a summary of the key flu indicators for the week ending October 11, 2014:

  • For the week ending October 11, the proportion of people seeing their health care provider for influenza-like illness (ILI) was below the national baseline. All 10 U.S. regions reported ILI activity below region-specific baseline levels.
  • 49 states and New York City experienced minimal ILI activity. The District of Columbia and one state (Vermont) did not have sufficient data to calculate an activity level. Puerto Rico experienced moderate ILI activity. ILI activity data indicate the amount of flu-like illness that is occurring in each state.
  • Guam reported widespread geographic influenza activity. Puerto Rico and four states (Florida, New Hampshire, North Dakota and Virginia) reported local activity. The District of Columbia and 36 states reported sporadic influenza activity. The U.S. Virgin Islands and ten states reported no influenza activity. Geographic spread data show how many areas within a state or territory are seeing flu activity.
  • Data regarding influenza-associated hospitalizations for the 2014-2015 influenza season is not yet available for this season.
  • The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Mortality Reporting System is below the epidemic threshold.
  • At this time, no influenza-associated pediatric deaths have been reported for the 2014-2015 flu season.
  • Nationally, the percentage of respiratory specimens testing positive for influenza viruses in the United States during the week ending October 11 was 3.7%. For the most recent three weeks, the regional percentage of respiratory specimens testing positive for influenza viruses ranged from 0.4% to 7.3%.
  • Influenza A (H3N2), 2009 influenza A (H1N1), and influenza B viruses have all been identified in the U.S. this season. During the week ending October 11, 164 (58.2%) of the 282 influenza-positive tests reported to CDC were influenza A viruses and 118 were influenza B viruses. Of the 30 influenza A viruses that were subtyped, 93% were H3 viruses and 7% were 2009 H1N1 viruses.
  • No antigenic characterization data is available for specimens collected after October 1, 2014.
  • No antiviral resistance data is available for specimens collected after October 1, 2014.

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 2014-2015 season can be found on the current FluView.

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