Update #8 for the week of February 4, 2013
This weeks Mitigation Journal Flu Update includes publicly available data from the CDC FluView, Google Flu Trends, Sickweather and other media sources.
This report contains data from the Centers for Disease Control and Prevention 2012/2013 Influenza season week 4 for the period ending January 26, 2013. In this reporting period (January 20-26, 2013) CDC flu data report ILI activity declining in some areas of the United States while high rates of activity persists. Indications point to declining ILI activity in the East and increasing in the West. The number of hospitalizations and deaths remain significantly elevated during this reporting period. Twenty-four states reported high level of ILI activity, down from twenty-six states in the prior week. Thirteen states report moderate ILI activity. Forty-two states reported widespread geographic influenza, down from forty-seven in last weeks report.
Viral surveillance results for week 4, 2013 shows 25.5% of 10,581 samples tested positive for influenza. This is down slightly from week 7 at 26.1%. The proportion of deaths related to influenza and pneumonia remain above epidemic threshold for week 4. The elderly continue to make up the majority of people hospitalized with ILI as 50% of hospitalizations were those aged 65 or older.
Outpatient ILI surveillance (those seen at clinics and doctors offices for ILI complaints) was 4.2% for week 4 (4.3% for week 3) and remained above 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
Google Flu Trends