Update #11 for the week of March 11, 2013
This report contains data from the Centers for Disease Control and Prevention 2012/2013 Influenza season week 9 for the period ending March 2, 2013. In this reporting period (February 24-March 2, 2013) CDC flu data report ILI activity is relatively unchanged from the prior reporting period (February 17-23, 2013) for most areas of the United States.
The number of hospitalizations remained elevated at 38.5 (up from 36.7 last week) per 100,000 population during this reporting period. Those greater than 65 years of age continue to account for greater than 50% of those hospitalized. Influenza and pneumonia related deaths are reported to be above the epidemic threshold. A total of 10,721 confirmed cases of influenza requiring hospitalization have been documented better October 1, 2012 and March 2, 1013.
Nine states reported widespread ILI activity during this reporting period, down from twenty-two states from twenty-six states in week 8.
Viral surveillance results for week 9, 2013 showed 17.2% of 6,259 samples testing positive for influenza as compared to last week when 16.9% of 7,609 samples were positive.
Outpatient ILI surveillance (those seen at clinics and doctors offices for ILI complaints) was down to 2.3% for week 9 as compared to 2.7% for week 8, edging closer to 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.
State-by-State week 9 reporting (from CDC website)
- Widespread influenza activity was reported by 9 states (Connecticut, Massachusetts, Nevada, New Jersey, New York, Ohio, Oregon, Pennsylvania, and Virginia).
- Puerto Rico and 24 states reported regional influenza activity (Alaska, Arizona, Arkansas, California, Colorado, Florida, Idaho, Iowa, Kansas, Kentucky, Illinois, Maine, Maryland, Michigan, Minnesota, Missouri, Montana, Nebraska, North Carolina, Oklahoma, Texas, Utah, Washington, and Wyoming).
- The District of Columbia and thirteen states (Alabama, Georgia, Louisiana, Mississippi, New Hampshire, New Mexico, North Dakota, South Carolina, South Dakota, Tennessee, Vermont, West Virginia, and Wisconsin) reported local influenza activity.
- Four states (Delaware, Hawaii, Indiana, and Rhode Island) reported sporadic influenza activity.
- Guam reported no influenza activity.
- The U.S. Virgin Islands did not report.
CDC Flu Interactive Map
|Click for Week 9 interactive map from CDC|
Google Flu Trends