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2012/2013 Flu Update #12

Update #12 for the week of March 16, 2013
Flu generally declining but, Influenza B cases rise

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 11 for the period ending March 16, 2013. In this reporting period (March 10-16, 2013) significant areas of ILI activity continues to steadily decline for most areas of the United States.

Accounting for 72% of all influenza cases reported during this period, influenza B virus is now the most prevalent strain according to the CDC.

The number of hospitalizations remained elevated at 40.6  per 100,000 (up from 38.5 last week) population during this reporting period. Those greater than 65 years of age account for 51% of those hospitalized. Influenza and pneumonia related deaths are reported to be above the epidemic threshold.

 Michigan is the only state to report high ILI activity (down from nine states in previous report) with five other states reporting moderate activity. Six states and NYC report low ILI activity while thirty-eight states now report minimal activity. 

Viral surveillance results for week 11, 2013 showed 16.3% of 5,526 samples testing positive for influenza as compared to last week when 17.2% of 6,259  samples were positive. Influenza A accounted for 28.1% of results with 2009 H1N1 4.7%, H3 34.4%, and Influenza B 71.9% (646 samples).

Outpatient ILI surveillance (those seen at clinics and doctors offices for ILI complaints) has returned to the national base line of 2.2% for the first time since November, 2012. The CDC cautions that this number may once again rise above the baseline as additional cases (due to late reporting) are added.

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.

State-by-State week 11 reporting (from CDC website)
  • Widespread influenza activity was reported by 7 states (Connecticut, Massachusetts, Nevada, New Jersey, New York, North Carolina, and Ohio).
  • Puerto Rico and 8 states reported regional influenza activity (Alaska, California, Michigan, Montana, Oklahoma, Pennsylvania, Utah, and Virginia).
  • Twenty-six states reported local influenza activity (Alabama, Arizona, Arkansas, Georgia, Idaho, Illinois, Iowa, Kentucky, Louisiana, Maryland, Minnesota, Mississippi, Missouri, Nebraska, New Hampshire, New Mexico, Oregon, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Washington, West Virginia, Wisconsin, and Wyoming).
  • Nine states reported sporadic influenza activity (Colorado, Delaware, Florida, Hawaii, Indiana, Kansas, Maine, North Dakota, and Vermont).
  • Guam reported no influenza activity.
  • The U.S. Virgin Islands and the District of Columbia did not report.

CDC Flu Interactive Map

Influenza-like Illness, ILI, activity indicator map application screenshot.
Click for Week 11 interactive map from CDC

Google Flu Trends

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