Actualización de la situación: Resumen del informe semanal FluView | Influenza estacional | CDC

Actualización de la situación: Resumen del informe semanal FluView | Influenza estacional | CDC

Actualización de la situación: resumen del informe semanal FluView

Indicadores claves de la influenza

According to this week's Fluview report, flu activity continues to increase slowly; however there are localized pockets of high activity in parts of the country and the percentage of respiratory specimens testing positive for flu in clinical laboratories increased. En este momento, los virus H1N1 son los más comunes. El virus H1N1 apareció en 2009 y provocó una pandemia. Las vacunas contra la influenza estacional han incluido el virus pandémico H1N1 desde 2010. Los CDC recomiendan que todas las personas a partir de los 6 meses de edad se vacunen contra la influenza todos los años. Si todavía no se vacunó esta temporada, debe hacerlo ahora. A continuación le ofrecemos un resumen de los indicadores claves de la influenza correspondientes a la semana que finalizó el 30 de enero de 2015:

• For the week ending January 30, the proportion of people seeing their proveedor de cuidados de salud for influenza-like illness (ILI) remained at 2.2%, which is above the national baseline (2.1%). Seis de 10 regiones (las regiones 1, 2, 3, 4, 6 y 10) informaron casos de ILI en o por encima de los niveles de referencia correspondientes a cada una. Una forma en la que los CDC miden la duración de la temporada de influenza es a través de la cantidad de semanas consecutivas en las que se informan casos de ILI en o por encima de los niveles de referencia nacional.
• Puerto Rico experimentó un alto nivel de actividad de ILI. Two states (Connecticut and Arkansas) experienced moderate ILI activity. New York City and 11 states (Arizona, Florida, Hawaii, Illinois, Maryland, Nevada, New Jersey, Oklahoma, Pennsylvania, Texas, and Utah) experienced low ILI activity. 37 states experienced minimal ILI activity. El Distrito de Columbia no contaba con datos suficientes para calcular el nivel de actividad. Los datos sobre la actividad de las ILI muestran la cantidad de enfermedades similares a la influenza que hay en cada uno de los estados.
• Widespread flu activity was reported by Puerto Rico and three states (California, Iowa, and Massachusetts). Regional flu activity was reported by Guam and 18 states (Arizona, Connecticut, Indiana, Kentucky, Maine, Maryland, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Rhode Island, Texas, Utah, Vermont, Virginia, and Washington). The District of Columbia and 16 states (Alabama, Alaska, Arkansas, Colorado, Florida, Idaho, Illinois, Michigan, Minnesota, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, and Wyoming) reported local influenza activity. Las Islas Vírgenes de Estados Unidos y 12 estados informaron actividad esporádica de la influenza. No flu activity was reported by one state (Mississippi). Los datos sobre la propagación geográfica muestran cuántas áreas en un estado o territorio presentan actividad de la influenza.
• Desde el 1 de octubre de 2015, se informaron 723 hospitalizaciones asociadas a la influenza confirmadas en laboratorio a través de FluSurv-NET, una red de vigilancia de las hospitalizaciones asociadas a la influenza confirmadas en laboratorio que se basa en la población. Esto se traduce en una tasa general acumulativa de 2.6 hospitalizaciones por cada 100,000 personas en los EE. UU. Más datos sobre los índices de hospitalización, incluidos los índices de hospitalización de otras temporadas de influenza, están disponibles en http://gis.cdc.gov/GRASP/Fluview/FluHospRates.html y enhttp://gis.cdc.gov/grasp/fluview/FluHospChars.html.
  • The highest hospitalization rates are among people 65 years and older (8.5 per 100,000), followed by children younger than 5 years (3.8 per 100,000). En la mayoría de las temporadas, los niños menores de 5 años y los adultos mayores de 65 años registraron los índices de hospitalización más elevados.
  • Los datos sobre las hospitalizaciones de FluSurv-NET se recopilan en 13 estados y representan alrededor del 8.5% de la población estadounidense total. La cantidad de hospitalizaciones informadas no refleja la cifra total real de hospitalizaciones asociadas a la influenza en los EE. UU.
• La proporción de muertes atribuidas a la neumonía y la influenza (N e I) estuvo por debajo del nivel de epidemia específico de cada sistema, tanto en el Sistema de vigilancia de mortalidad del NCHS como en el Sistema de Comunicación de Mortalidad de 122 Ciudades.
• Two influenza-associated pediatric deaths were reported to CDC during the week ending January 30. A total of nine influenza-associated pediatric deaths have been reported during the 2015-2016 season.
• A nivel nacional, el porcentaje de muestras respiratorias que dieron positivo para los virus de la influenza en laboratorios clínicos durante la semana que finalizó el 30 de enero fue del 6.8%. Teniendo en cuenta las últimas tres semanas, el porcentaje a nivel regional de muestras respiratorias que dieron positivo para los virus de la influenza en laboratorios clínicos varió entre el 1.0% y el 10.9%.
  • During the week ending January 30, of the 1,085 influenza-positive tests reported to CDC by clinical laboratories, 739 (68.1%) were influenza A viruses and 346 (31.9%) were influenza B viruses.
• El tipo de virus de la influenza que identificaron con mayor frecuencia os laboratorios de salud pública durante la semana que finalizó el 30 de enero fueron los virus de la influenza A, con predominio de los virus de la influenza A (H1N1)pdm09.
  • Durante la semana que finalizó el 30 de enero, 273 (74.2%) de las 368 pruebas que dieron positivo para la influenza y que informaron a los CDC los laboratorios de salud pública eran virus de la influenza A y 95 (25.8%) eran virus de la influenza B. Of the 222 influenza A viruses that were subtyped, 55 (24.8%) were H3 viruses and 167 (75.2%) were  (H1N1)pdm09 viruses.
  • En cifras acumuladas, entre el 4 de octubre de 2015 y el 30 de enero de 2016, los virus de la influenza A (H3) predominaron en dos de los cuatro grupos etarios que variaron entre el 35.7% (entre 5 a 24 años) y el 51.0% (mayores de 65). Los virus de la influenza A (H1N1)pdm09 fueron los predominantes en el grupo etario de 0 a 4 años (60.4%) y en el grupo de 25 a 64 años (58.8%).
• Los CDC han caracterizado 407 muestras (130 virus de la influenza A (H1N1)pdm09, 190 de la influenza A (H3N2) y 87 de la influenza B) que se recogieron en los EE. UU. a partir del 1 de octubre de 2015.
  • Los 130 (100%) virus de la influenza A (H1N1)pdm09 que se caracterizaron antigénicamente resultaron ser similares al tipo A/California/7/2009, el componente de la influenza A (H1N1) de la vacuna 2015-2016 para el hemisferio norte.
  • Los 190 virus H3N2 fueron genéticamente secuenciados y todos los virus pertenecían a grupos genéticos para los que una mayoría de los virus antigénicamente caracterizados eran similares al A/Switzerland/9715293/2013 propagado en cultivo celular, el componente de la influenza A (H3N2) de la vacuna del hemisferio norte para 2015-2016.
    • Un subgrupo de 93 virus H3N2 también se caracterizó antigénicamente; 92 de los 93 (98.9%) virus H3N2 resultaron ser similares al tipo A/Switzerland/9715293/2013 mediante la prueba de neutralización o HI.
  • Los 52 virus (100%) de la línea B/Yamagata fueron caracterizados antigénicamente como similares al B/Phuket/3073/2013, incluido en las vacunas trivalente y tetravalente para 2015-16 del hemisferio norte.
  • Los 35 (100%) virus de la línea B/Victoria que se caracterizaron antigénicamente resultaron ser similares al virus B/Brisbane/60/2008, el cual está incluido en la vacuna tetravalente 2015-16 para el hemisferio norte.
• Desde el 1 de octubre de 2015, los CDC han examinado 229 virus de la influenza A (H1N1)pdm09, 225 virus de la influenza A (H3N2) y 130 virus de la influenza B para conocer la resistencia a los medicamentos antivirales inhibidores de neuraminidasa. While the vast majority of the viruses that have been tested are sensitive to oseltamivir, zanamivir, and peramivir, one additional influenza A (H1N1)pdm09 virus that was reported during the week ending January 30, 2016, showed resistance to oseltamivir and peramivir.  So far this season, 2 (0.9%) influenza A (H1N1)pdm09 viruses have showed resistance to oseltamivir and peramivir (but both were sensitive to zanamivir).

FluView está disponible - y las ediciones anteriores archivadas - en el sitio web de los CDC.

Nota: Las demoras en los informes pueden indicar que los datos cambian con el paso del tiempo. Los datos más actualizados de todas las semanas que comprenden la temporada 2015-2016 pueden encontrarse en el informe actual de FluView.

* Los enlaces a sitios web pueden llevar a páginas en inglés o español.

Descargo de responsabilidad: Es posible que en este sitio encuentre algunos enlaces que le lleven a contenido disponible sólo en inglés. Además, el contenido que se ha traducido del inglés se actualiza a menudo, lo cual puede causar la aparición temporal de algunas partes en ese idioma hasta que se termine de traducir (generalmente en 24 horas). Llame al 1-800-CDC-INFO si tiene preguntas sobre la influenza estacional, cuyas respuestas no ha encontrado en este sitio. Agradecemos su paciencia.

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Weekly Influenza Surveillance

The most recent FluView report shows increasing flu activity in the United States. Further increases in activity are expected in the coming weeks. Flu activity most often peaks in February and can last into May. It is not too late to get your flu vaccine this season. Flu vaccines this season have been updated to better match circulating viruses and most circulating viruses so far are still like the recommended vaccine viruses for this season.

CDC recommends a yearly flu vaccine for everyone 6 months and older. Vaccination can reduce flu illnesses, doctors' visits, and missed work and school due to flu, as well as prevent flu-related hospitalizations. More than 146.0 million doses of flu vaccine have been distributed in the United States. It takes about two weeks after vaccination for protection to set in, making now the perfect time to get vaccinated. Find a Vaccine.

Learn More!

Key Flu Indicators

According to this week’s Fluview report, flu activity continues to increase slowly; however there are localized pockets of high activity in parts of the country and the percentage of respiratory specimens testing positive for flu in clinical laboratories increased. H1N1 viruses are most common at this time. This H1N1 virus emerged in 2009 to cause a pandemic. Seasonal flu vaccines have included the H1N1 pandemic virus since 2010. CDC recommends an annual flu vaccine for everyone 6 months of age and older. If you have not gotten vaccinated yet this season, you should get vaccinated now. Below is a summary of the key flu indicators for the week ending January 30, 2015:

• For the week ending January 30, the proportion of people seeing their health care provider for influenza-like illness (ILI) remained at 2.2%, which is above the national baseline (2.1%). Six of 10 regions (Regions 1, 2, 3, 4, 6 and 10) reported ILI at or above their region-specific baseline levels. One way that CDC measures the length of the influenza season is the number of consecutive weeks during which ILI is at or above the national baseline.
• Puerto Rico experienced high ILI activity. Two states (Connecticut and Arkansas) experienced moderate ILI activity. New York City and 11 states (Arizona, Florida, Hawaii, Illinois, Maryland, Nevada, New Jersey, Oklahoma, Pennsylvania, Texas, and Utah) experienced low ILI activity. 37 states 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.
• Widespread flu activity was reported by Puerto Rico and three states (California, Iowa, and Massachusetts). Regional flu activity was reported by Guam and 18 states (Arizona, Connecticut, Indiana, Kentucky, Maine, Maryland, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Rhode Island, Texas, Utah, Vermont, Virginia, and Washington). The District of Columbia and 16 states (Alabama, Alaska, Arkansas, Colorado, Florida, Idaho, Illinois, Michigan, Minnesota, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, and Wyoming) reported local influenza activity. The U.S. Virgin Islands and 12 states reported sporadic influenza activity. No flu activity was reported by one state (Mississippi). Geographic spread data show how many areas within a state or territory are seeing flu activity.
• Since October 1, 2015, 723 laboratory-confirmed influenza-associated hospitalizations have been reported through FluSurv-NET, a population-based surveillance network for laboratory-confirmed influenza-associated hospitalizations. This translates to a cumulative overall rate of 2.6 hospitalizations per 100,000 people in the United States. More data on hospitalization rates, including hospitalization rates during other influenza seasons, are available at http://gis.cdc.gov/GRASP/Fluview/FluHospRates.html andhttp://gis.cdc.gov/grasp/fluview/FluHospChars.html.
  • The highest hospitalization rates are among people 65 years and older (8.5 per 100,000), followed by children younger than 5 years (3.8 per 100,000). During most seasons, children younger than 5 years and adults 65 years and older have the highest hospitalization rates.
  • FluSurv-NET hospitalization data are collected from 13 states and represent approximately 8.5% of the total U.S. population. The number of hospitalizations reported does not reflect the actual total number of influenza-associated hospitalizations in the United States.
• The proportion of deaths attributed to pneumonia and influenza (P&I) was below the system-specific epidemic threshold in both the NCHS Mortality Surveillance System and the 122 Cities Mortality Reporting System.
• Two influenza-associated pediatric deaths were reported to CDC during the week ending January 30. A total of nine influenza-associated pediatric deaths have been reported during the 2015-2016 season.
• Nationally, the percentage of respiratory specimens testing positive for influenza viruses in clinical laboratories during the week ending January 30 was 6.8%. For the most recent three weeks, the regional percentage of respiratory specimens testing positive for influenza viruses in clinical laboratories ranged from 1.0% to 10.9%.
  • During the week ending January 30, of the 1,085 influenza-positive tests reported to CDC by clinical laboratories, 739 (68.1%) were influenza A viruses and 346 (31.9%) were influenza B viruses.
• The most frequently identified influenza virus type reported by public health laboratories during the week ending January 30 was influenza A viruses, with influenza A (H1N1)pdm09 viruses predominating.
  • During the week ending January 30, 273 (74.2%) of the 368 influenza-positive tests reported to CDC by public health laboratories were influenza A viruses and 95 (25.8%) were influenza B viruses. Of the 222 influenza A viruses that were subtyped, 55 (24.8%) were H3 viruses and 167 (75.2%) were  (H1N1)pdm09 viruses.
  • Cumulatively from October 4, 2015-January 30, 2016, influenza A (H3) viruses were predominant in two of the four age groups ranging from 35.7% (ages 5-24 years) to 51.0% (ages 65 years and older). Influenza A (H1N1)pdm09 viruses were predominant in the 0-4 years age group (60.4%) and in the 25-64 years age group (58.8%).
• CDC has characterized 407 specimens (130 influenza A (H1N1)pdm09, 190 influenza A (H3N2) and 87 influenza B viruses) collected in the U.S. since October 1, 2015.
  • All 130 (100%) influenza A (H1N1)pdm09 viruses were antigenically characterized as similar to A/California/7/2009, the influenza A (H1N1) component of the 2015-2016 Northern Hemisphere vaccine.
  • All 190 H3N2 viruses were genetically sequenced and all viruses belonged to genetic groups for which a majority of viruses antigenically characterized were similar to cell-propagated A/Switzerland/9715293/2013, the influenza A (H3N2) component of the 2015-2016 Northern Hemisphere vaccine.
    • A subset of 93 H3N2 viruses also were antigenically characterized; 92 of 93 (98.9%) H3N2 viruses were similar to A/Switzerland/9715293/2013 by HI testing or neutralization testing.
  • All 52 (100%) of the B/Yamagata-lineage viruses were antigenically characterized as similar to B/Phuket/3073/2013, which is included in both the 2015–16 Northern Hemisphere trivalent and quadrivalent vaccines.
  • All 35 (100%) of the B/Victoria-lineage viruses were antigenically characterized as similar to B/Brisbane/60/2008, which is included in the 2015-16 Northern Hemisphere quadrivalent vaccine.
• Since October 1, 2015, CDC has tested 229 influenza A (H1N1)pdm09, 225 influenza A (H3N2), and 130 influenza B viruses for resistance to the neuraminidase inhibitors antiviral drugs. While the vast majority of the viruses that have been tested are sensitive to oseltamivir, zanamivir, and peramivir, one additional influenza A (H1N1)pdm09 virus that was reported during the week ending January 30, 2016, showed resistance to oseltamivir and peramivir.  So far this season, 2 (0.9%) influenza A (H1N1)pdm09 viruses have showed resistance to oseltamivir and peramivir (but both were sensitive to zanamivir).

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 2015-2016 season can be found on the current FluView.

U.S. Situation Update

Percentage of Visits for
Influenza-like Illness (ILI)

Pneumonia and Influenza
Mortality for 122 Cities

Influenza-Associated Pediatric Mortality

Geographic Spread of Influenza

Influenza Positive Tests Reported to CDC