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# 2009-2010 Influenza Season Week 43 ending October 31, 2009
- URL: https://www.foodconsumer.org/2009-2010_influenza_season_week_43_ending_october_31_2009_081120/
- Published: 2009-11-08T07:35:00.000Z
- Updated: 2026-09-15T12:32:32.000Z
- Description: During the week ending October 31, 2009, 37.2% of tested specimens were positive for influenza, and over 99% of subtyped influenza A was 2009 H1N1. Eighteen pediatric deaths were reported, and 48 states reported geographically widespread activity.
- Author: Food Consumer
- Tags: Disease, Health News, H1N1, #vivvo-import

### 2009-2010 Influenza Season Week 43 ending October 31, 2009

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

### Synopsis:

During week 43 (October 25-31, 2009), influenza activity remained elevated in the U.S.

- 5,258 (37.2%) 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 were positive for influenza.
- Over 99% of all subtyped influenza A viruses being reported to CDC were 2009 influenza A (H1N1) viruses.
- The proportion of deaths attributed to pneumonia and influenza (P&I) was above the epidemic threshold.
- Eighteen influenza-associated pediatric deaths were reported. Fifteen of these deaths were associated with 2009 influenza A (H1N1) virus infection and three were associated with an influenza A virus for which the subtype was undetermined.
- The proportion of outpatient visits for influenza-like illness (ILI) was above the national baseline. All 10 regions reported ILI above region-specific baseline levels.
- Forty-eight states reported geographically widespread influenza activity, two states reported regional influenza activity, the District of Columbia reported local influenza activity; Puerto Rico and Guam reported sporadic influenza activity, and the U.S. Virgin Islands did not report.