Situation Update: Summary of Weekly FluView
Key Flu Indicators
Today, October 14, 2011, CDC issued the first edition of FluView, its weekly influenza surveillance report, for the 2011-2012 season. CDC tracks flu activity year-round and releases the information in FluView from October through late May. Today's issue contains data for the summer weeks of the 2010-2011. During this first reporting week for the 2011-2012 season, nationally all key flu indicators were low. Below is a summary of the most recent key indicators:Below is a summary of the most recent key flu indicators:
- Visits to doctors for influenza-like illness (ILI) were low nationally, with all 10 U.S. regions reporting ILI below region-specific baseline levels.
- No states reported widespread, regional or local influenza activity. Sporadic influenza activity was reported by 20 states and the District of Columbia, Puerto Rico and the U.S. Virgin Islands. Twenty-nine states and Guam reported no influenza activity. One state did not report.
- The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report was below what is expected for this time of year.
- No influenza-associated pediatric deaths were reported this week, but one pediatric death occurred during the summer weeks of the 2010-2011 season, and was associated with an influenza B virus.
- Nationally, the percentage of specimens testing positive for influenza was 1.2%.
- Influenza viruses identified so far include 2009 H1N1 viruses, influenza A (H3N2) viruses and influenza B viruses. Overall, these viruses remain similar to the viruses chosen for the 2011-2012 flu vaccine, and remain susceptible to the antiviral drugs oseltamivir and zanamivir.
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