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2012/2013 Flu Update #14

Update #14 for the week ending April 6, 2013

Influenza B Dominates Declining Flu Season

Publication Notice: Update #14 will be the final seasonal Flu Update for the 2013/2014 flu season. Weekly updates will continue under the post title of Biologic Update and will include information on Dengue, novel Avian Influenza, novel Corona Virus, seasonal flu and other emerging diseases. Specific Flu Updates will return with for the 2013/2014 flu season in the United States.

This weeks Mitigation Journal Flu Update includes publicly available data from the CDC FluView, Google Flu Trends and other media sources.

This report contains data from the Centers for Disease Control and Prevention 2012/2013 Influenza season week 13 for the period ending March 30, 2013. In this reporting period (March 24-30, 2013) pockets of influenza persist throughout the United States with Influenza B accounting for 75% (up from 72% in previous report) of all influenza cases.

The number of hospitalizations reported this period was 42.3 per 100,000 and up slightly from last weeks number of  41.8  per 100,000  population. Those greater than 65 years of age account for 50% of those hospitalized. Influenza and pneumonia related deaths are now reported to be below the epidemic threshold.

 All 50 states report low or minimal ILI activity. No regions report high or moderate activity.  

Viral surveillance results for week 13, 2013 showed 11.3% of 4,909 samples (down from 13.2% of 702 samples last week) testing positive for influenza. Influenza A accounted for 25.2% (down from 26.5%) of results with 2009 H1N1 11.4%, H3 25.7%, and Influenza B 74.8% (up from 73.5%) of circulating flu.

Outpatient ILI surveillance (those seen at clinics and doctors offices for ILI complaints) remains at 1.8% and is below the national base line of 2.2%.

Antiviral resistance is a non-issue at this point. None of the circulating strains (H1N1, H3N2 or Influenza B) are resistant to Oseltamivir or Zanamivir.

CDC Flu Interactive Map

Influenza-like Illness, ILI, activity indicator map application screenshot.
Click for Week 13 interactive map from CDC

Google Flu Trends

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