Re: Fluview 2011-2012 Flu Season: Weeks 40-3
Week 3:
During week 3 (January 15-21, 2012), influenza activity in the United States remained relatively low.
U.S. Virologic Surveillance: Of the 3,572 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, 175 (4.9%) were positive for influenza.
Pneumonia and Influenza (P&I) Mortality Surveillance: The proportion of deaths attributed to P&I was 7.8%, slightly above the epidemic threshold.
Influenza-associated Pediatric Mortality: One influenza-associated pediatric death was reported and was associated with an influenza B virus infection. (Occurring in week 43)
Outpatient Illness Surveillance:The proportion of outpatient visits for influenza-like illness (ILI) was 1.4%, which is below the national baseline of 2.4%. All 10 regions reported ILI below region-specific baseline levels. New York City and all 50 states experienced minimal ILI activity and the District of Columbia had insufficient data.
Geographic Spread of Influenza: The geographic spread of influenza in four states (Colorado, Kentucky, Missouri, and Virginia) was reported as regional; eight states reported local activity; Guam and 35 states reported sporadic activity; the U.S. Virgin Islands and three states reported no influenza activity, and the District of Columbia and Puerto Rico did not report.
Between October 1, 2011 and January 21, 2012, 166 laboratory-confirmed influenza hospitalizations were reported, a rate of 0.6 per 100,000 population. Among cases, 120 (72.3%) were influenza A, 38 (22.9%) were influenza B, and 2 (1.2%) were influenza A and B co-infections; 6 (3.6%) had no virus type information. Among those with influenza A subtype information, 48 were H3N2 and 4 were 2009 H1N1. The most commonly reported underlying medical conditions among adults were chronic lung diseases, asthma and obesity. The most common underlying medical conditions in children were neurologic disorders and obesity. However, more than a third of hospitalized children had no identified underlying medical conditions.
Week 3:
During week 3 (January 15-21, 2012), influenza activity in the United States remained relatively low.
U.S. Virologic Surveillance: Of the 3,572 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, 175 (4.9%) were positive for influenza.
Pneumonia and Influenza (P&I) Mortality Surveillance: The proportion of deaths attributed to P&I was 7.8%, slightly above the epidemic threshold.
Influenza-associated Pediatric Mortality: One influenza-associated pediatric death was reported and was associated with an influenza B virus infection. (Occurring in week 43)
Outpatient Illness Surveillance:The proportion of outpatient visits for influenza-like illness (ILI) was 1.4%, which is below the national baseline of 2.4%. All 10 regions reported ILI below region-specific baseline levels. New York City and all 50 states experienced minimal ILI activity and the District of Columbia had insufficient data.
Geographic Spread of Influenza: The geographic spread of influenza in four states (Colorado, Kentucky, Missouri, and Virginia) was reported as regional; eight states reported local activity; Guam and 35 states reported sporadic activity; the U.S. Virgin Islands and three states reported no influenza activity, and the District of Columbia and Puerto Rico did not report.
Between October 1, 2011 and January 21, 2012, 166 laboratory-confirmed influenza hospitalizations were reported, a rate of 0.6 per 100,000 population. Among cases, 120 (72.3%) were influenza A, 38 (22.9%) were influenza B, and 2 (1.2%) were influenza A and B co-infections; 6 (3.6%) had no virus type information. Among those with influenza A subtype information, 48 were H3N2 and 4 were 2009 H1N1. The most commonly reported underlying medical conditions among adults were chronic lung diseases, asthma and obesity. The most common underlying medical conditions in children were neurologic disorders and obesity. However, more than a third of hospitalized children had no identified underlying medical conditions.
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