sábado, 31 de enero de 2015

Weekly U.S. Influenza Surveillance Report | Seasonal Influenza (Flu) | CDC

Weekly U.S. Influenza Surveillance Report | Seasonal Influenza (Flu) | CDC

FluView: A Weekly Influenza Surveillance Report Prepared by the Influenza Division

2014-2015 Influenza Season Week 3 ending January 24, 2015


During week 3 (January 18-24, 2015), influenza activity remained elevated in the United States.
  • Viral Surveillance: Of 23,339 specimens tested and reported by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories during week 3, 4,651 (19.9%) were positive for influenza.
  • Novel Influenza A Virus: One human infection with a novel influenza A virus was reported.
  • Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and influenza (P&I) was above the epidemic threshold.
  • Influenza-associated Pediatric Deaths: Five influenza-associated pediatric deaths were reported.
  • Influenza-associated Hospitalizations: A cumulative rate for the season of 40.5 laboratory-confirmed influenza-associated hospitalizations per 100,000 population was reported.
  • Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 4.4%, above the national baseline of 2.0%. All 10 regions reported ILI at or above region-specific baseline levels. Puerto Rico and 29 states experienced high ILI activity; New York City and seven states experienced moderate ILI activity; six states experienced low ILI activity; eight states experienced minimal ILI activity; and the District of Columbia had insufficient data.
  • Geographic Spread of Influenza: The geographic spread of influenza in Puerto Rico and 44 states was reported as widespread; the U.S. Virgin Islands and five states reported regional activity; and the District of Columbia, Guam, and one state reported local activity.

What's New?


Flu activity is high across most of the country with flu illnesses, hospitalizations and deaths elevated. Flu season will probably continue for several weeks.
While the flu vaccine is not working as well as usual against some H3N2 viruses, vaccination can still protect some people and reduce hospitalizations and deaths, and will protect against other flu viruses.
Influenza antiviral drugs can treat flu illness. CDC recommends these drugs be used to treat people who are very sick or who are at high risk of serious flu complications who have flu symptoms. Early antiviral treatment works best.
Learn More!

Influenza Antiviral Quiz for Clinicians

Test your knowledge of influenza antiviral drugs with the new Influenza Antiviral Quiz for Clinicians.
Take the Quiz!

Prompt Use of Antivirals is Key this Flu Season

Prompt Use of Antivirals is Key this Flu Season

Antiviral influenza (flu) medications are effective in treating the flu and reducing complications, and are critical tools for reducing the burden of flu illness. Unfortunately, evidence from previous and the current flu season suggest that flu antiviral drugs are severely underused.
Influenza activity in the United States is widespread and likely to continue for weeks. Read more about what physicians can do.
Learn More

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