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Situación: FluView semanal

Indicadores fundamentales de la influenza

According to this week's FluView report, overall seasonal influenza activity remains low across the United States, but there are early signs that activity is increasing, including the first reported pediatric flu death of the 2014-2015 season. Flu activity is expected to increase 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 18, 2014:

  • For the week ending October 18, the proportion of people seeing their proveedor de cuidados de salud por enfermedades similares a la influenza (ILI) estuvo por debajo del porcentaje nacional. This week, Region 2 (NJ, NY, PR) reported ILI activity above their region-specific baseline level. The increase in ILI activity in Region 2 was due primarily to high ILI activity in Puerto Rico. The other nine regions reported activity levels below region-specific baselines.
  • Puerto Rico experienced high ILI activity. One state (Louisiana) experienced low ILI activity. 49 states and New York City experienced minimal ILI activity. The District of Columbia did not have sufficient data to calculate an activity level. 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 five states (Alaska, Connecticut, Florida, North Carolina, and Texas) reported local activity. The U.S. Virgin Islands and 36 states reported sporadic influenza activity. The District of Columbia and nine 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.
  • La proporción de muertes atribuidas a la neumonía y a la influenza (N e I) basada en el informe del Sistema de Comunicación de Mortalidad de 122 ciudades se mantiene por debajo del nivel de epidemia.
  • Two influenza-associated pediatric deaths were reported to CDC during the week ending October 18. One death occurred during this season (the week ending October 4, 2014) and was associated with an influenza A (H3) virus. This is the first influenza-associated pediatric death reported for the 2014-2015 season.
    • The other death occurred during the 2013-2014 season and was associated with an influenza B virus. This brings the total number of pediatric deaths reported for the 2013-2014 season to 109.
  • Nationally, the percentage of muestras respiratorias testing positive for influenza viruses in the United States during the week ending October 18 increased once again to 4.8%. For the most recent three weeks, the regional percentage of respiratory specimens testing positive for influenza viruses ranged from 1.1% to 8.0%.
  • 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 18, 268 (66.5%) of the 403 influenza-positive tests reported to CDC were influenza A viruses and 135 (33.5%) were influenza B viruses. Of the 99 influenza A viruses that were subtyped, 97% were H3 viruses and 3% were 2009 H1N1 viruses.
  • One infection with an influenza A (H3N2) variant virus (H3N2v) was reported to CDC during the week ending October 18, 2014 by Wisconsin. The patient is reported to have had close contact with swine in the week prior to illness onset. No ongoing human-to-human transmission has been identified. This is the first H3N2v infection reported for the 2014-2015 influenza season, which began on September 28, 2014.
  • 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 - en el sitio web de los CDC.

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.