Influenza – Week 10 2008
During week 10 (March 2 – 8, 2008), influenza activity continued to decrease in the United States.
One thousand nine hundred thirty-six (21.6%) specimens tested by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories were positive for influenza.
The proportion of deaths attributed to pneumonia and influenza was above the epidemic threshold for the ninth consecutive week.
The proportion of outpatient visits for influenza-like illness (ILI) was above national baseline levels, while the proportion of outpatient visits for acute respiratory illness (ARI) was below national baseline levels. ILI decreased in eight of the nine regions compared to week 9, and fell below the region specific baseline in the Mid-Atlantic region, but remained above region-specific baselines in the remaining eight regions. The West North Central region reported ARI above its region-specific baseline.
Forty-two states reported widespread influenza activity; eight states reported regional influenza activity; the District of Columbia reported local influenza activity; and Puerto Rico reported sporadic influenza activity.
During week 10, 8.7% of all deaths reported through the 122 Cities Mortality Reporting System were reported as due to P&I. This percentage is above the epidemic threshold of 7.2% for week 10. Including week 10, P&I mortality has been above epidemic threshold for nine consecutive weeks.
Eight influenza-associated pediatric deaths were reported to CDC during week 10 [ME, MA, NJ, NM, PA(2), VA, and WI]. These deaths occurred between February 15 and March 2, 2008. One additional death from Illinois, confirmed during week 9, was not reported last week. Since September 30, 2007, CDC has received a total of 41 reports of influenza-associated pediatric deaths that occurred during the current season.
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