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Published On: Sat, Jan 5th, 2013

Flu activity up in the United States, influenza A (H3N2) most common

Image/CDC

Image/CDC

Influenza  activity continues to increase across most parts of the country, with nine out of 10 surveillance regions in the US seeing elevated activity, according to data from the Centers for Disease Control and Prevention (CDC) released Jan.4.

During the last week of 2012, the proportion of outpatient visits for influenza-like illness (ILI) was 5.6%; above the national baseline of 2.2%. Nine of 10 regions reported ILI above region-specific baseline levels. New York City and approximately 60 percent (29) of the states experienced high ILI activity. This is up from 16 states the previous week.

Between October 1, 2012 and December 29, 2012, 2,257 laboratory-confirmed influenza-associated hospitalizations were reported. This is a rate of 8.1 per 100,000 population. Among all hospitalizations, 1,924 (85.2%) were associated with influenza A and 312 (13.8%) with influenza B.

There were 18 pediatric deaths due to influenza during the last quarter of 2012.

Since the start of the season, influenza A (H3N2) viruses have predominated nationally, followed by influenza B viruses, while 2009 H1N1 viruses have been identified rarely.

The majority of currently circulating influenza viruses are susceptible to the neuraminidase inhibitor antiviral medications oseltamivir (Tamiflu) and zanamivir (Relenza). The CDC continues to recommend influenza vaccination and antiviral treatment when appropriate at this time.

Antiviral treatment, started as early as possible after becoming ill, is recommended for any patients with confirmed or suspected influenza who are hospitalized, seriously ill, or ill and at high risk of serious influenza-related complications, including young children, people 65 and older, people with certain underlying medical conditions and pregnant women.

Treatment should begin as soon as influenza is suspected, regardless of vaccination status or rapid test results and should not be delayed for confirmatory testing, according to the federal health agency.

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About the Author

- Writer, Co-Founder and Executive Editor of The Global Dispatch. Robert has been covering news in the areas of health, world news and politics for a variety of online news sources. He regularly writes about infectious disease news for Examiner.com and administers the Outbreak News section of The Global Dispatch.

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  1. [...] fact, health officials suggest the increased death toll this season may be due the circulation of H3N2 influenza, a more severe [...]

  2. [...] Centers for Disease Control and Prevention (CDC) says that influenza activity is up across the country and the state of Florida is no exception. The Florida Department of Health (DoH) reports that [...]

  3. [...] In the United States, influenza A predominates with H3N2 being the most common strain. [...]

  4. [...] flu outbreak this season is not limited to Boston or Massachusetts in general, instead increased influenza activity is being seen [...]

  5. [...] (flu) activity has increased across most parts of the United States, and Maine is no exception. Influenza activity is significantly higher than the 2011-2012 season [...]

  6. [...] update issued Jan. 4 by the U.S. Centers for Disease Control and Prevention (CDC). According …Flu activity up in the United States, influenza A (H3N2) most commonThe Global DispatchFlu activity in United States earlier and more severeExaminer.comComox Valley [...]

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