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      1. PDF formatted for print
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        Weekly Report: Influenza Summary Update

        2007-2008 Influenza Season Week 20, ending May 17, 2008

        Influenza-Associated Pediatric Mortality
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        Influenza-Associated Pediatric Hospitalizations

        Laboratory-confirmed influenza-associated pediatric hospitalizations are monitored in two population-based surveillance networks: the New Vaccine Surveillance Network (NVSN) and the Emerging Infections Program (EIP). These two systems provide updates of surveillance data every two weeks. As a result of differing dates for initiating surveillance in the 2007-08 season, these updates occur on alternating weeks.

        During November 4, 2007 to May 3, 2008, the preliminary laboratory-confirmed influenza-associated hospitalization rate for children 0-4 years old in the NVSN was 10.66 per 10,000.

        EIP Influenza Laboratory chart
        View Full Screen

        During September 30, 2007 – May 10, 2008, the preliminary laboratory-confirmed influenza-associated hospitalization rate reported by the EIP for children 0–17 years old was 1.54 per 10,000. For children aged 0-4 years and 5-17 years, the rate was 4.03 per 10,000 and 0.55 per 10,000, respectively.

        EIP Influenza Laboratory chart
        View Full Screen

        Outpatient Illness Surveillance

        Nationwide during week 20, 0.8% of outpatient visits reported through the U.S. Influenza Sentinel Provider Surveillance Network were due to influenza-like illness (ILI), which was below the national baseline of 2.2%. On a regional level, the percentage of outpatient visits for ILI ranged from 0.2% to 1.4%. All nine regions reported ILI below their region-specific baselines.

        During week 20, 1.7% of patient visits to Department of Veteran’s Affairs (VA) and Department of Defense (DoD) outpatient treatment facilities were for acute respiratory illness (ARI), which was below the national baseline of 3.2%. On a regional level, the percentage of visits for ARI ranged from 0.8% to 2.1%, and was below region-specific baselines in all nine regions. All five age groups reported ARI below their age-specific baselines.

        national levels of ILI and ARI
        View Sentinel Providers Regional Charts | View Chart Data |View Full Screen
        Bar Chart for Influenza-like Illness
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        Geographic Spread of Influenza as Assessed by State and Territorial Epidemiologists

        During week 20 the following influenza activity was reported:

        • Sporadic influenza activity was reported by 23 states (Alaska, Arizona, California, Colorado, Connecticut, Hawaii, Illinois, Indiana, Louisiana, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, New Jersey, New York, North Dakota, Pennsylvania, South Carolina, Texas, Utah, and Vermont).
        • No influenza activity was reported by the District of Columbia and 26 states (Alabama, Arkansas, Delaware, Florida, Georgia, Iowa, Kansas, Kentucky, Maine, Maryland, Nebraska, Nevada, New Hampshire, New Mexico, North Carolina, Ohio, Oklahoma, Oregon, Rhode Island, South Dakota, Tennessee, Virginia, Washington, West Virginia, Wisconsin, and Wyoming).
        • One state (Idaho) did not report.

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        A description of surveillance methods is available at: http://www.cy118119.com/flu/weekly/fluactivity.htm

        • Page last updated September 04, 2008.
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