FluView : 2010-2011 Influenza Season ; Week 9 ending March 5, 2011
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FluView : 2010-2011 Influenza Season ; Week 9 ending March 5, 2011

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    All data are preliminary and may change as more reports are received.

    Synopsis: During week 9 (February 27-March 5, 2011), influenza activity in the United States decreased.

    • Of the 7,556 specimens tested by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories and reported to CDC/Influenza Division, 1,869 (24.7%) were positive for influenza.

    • The proportion of deaths attributed to pneumonia and influenza (P&I) was above the epidemic threshold for the sixth consecutive week.

    • Five influenza-associated pediatric deaths were reported bringing the season total to 60. Three of these deaths were associated with an influenza B virus and two were associated with an influenza A virus for which the subtype was not determined.

    • The proportion of outpatient visits for influenza-like illness (ILI) was 3.1%, which is above the national baseline of 2.5%. Eight of the 10 regions (Regions 1, 2, 3, 4, 5, 7, 8 and 10) reported ILI at or above region-specific baseline levels. Ten states experienced high ILI activity; 12 states experienced moderate ILI activity; nine states experienced low ILI activity; 19 states and New York City experienced minimal ILI activity, and the District of Columbia had insufficient data.

    • The geographic spread of influenza in 39 states was reported as widespread; nine states reported regional influenza activity; the District of Columbia and two states reported local influenza activity; Guam and the U.S. Virgin Islands reported sporadic influenza activity, and Puerto Rico did not report.


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