CDC H1N1 Flu Website Situation Update, November 30, 2009

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Title: CDC H1N1 Flu Website Situation Update, November 30, 2009

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CDC H1N1 Flu Website Situation Update, November 30, 2009

Key Flu Indicators

Each week CDC analyzes information about influenza disease activity in the United States and publishes findings of key flu indicators in a report called FluView. During the week of November 15-21, 2009, influenza activity decreased in some key indicators and increased in others. Overall influenza activity remains high for this time of year. Below is a summary of the most recent key indicators:

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

Learn more >> 

U.S. Situation Update

Weekly Flu Activity Estimates

U.S. Patient Visits Reported for Influenza-like Illness (ILI)

U.S. Influenza-like Illness (ILI) Reported by Regions

U.S. Laboratory Confirmed Influenza-Associated Hospitalizations
and Deaths from August 30 to November 21, 2009

Posted November 30, 2009, 11:00 AM ET
Data reported to CDC by November 24, 2009, 12:00 AM ET
Cases Defined by
Hospitalizations
Deaths
Influenza Laboratory-Tests** 29,348 1,224

*Reports can be based on syndromic, admission or discharge data, or a combination of data elements that could include laboratory-confirmed and influenza-like illness hospitalizations.

*Laboratory confirmation includes any positive influenza test (rapid influenza tests, RT-PCR, DFA, IFA, or culture), whether or not typing was done.

The table shows aggregate reports of all laboratory confirmed influenza hospitalizations and deaths (including 2009 H1N1 and seasonal flu) since August 30, 2009 received by CDC from U.S. states and territories**. This table will be updated weekly each Friday at 11 a.m. For the 2009-2010 influenza season, states are reporting based on new case definitions for hospitalizations and deaths effective August 30, 2009.

CDC will continue to use its traditional surveillance systems to track the progress of the 2009-2010 influenza season. For more information about influenza surveillance, including reporting of influenza-associated hospitalizations and deaths, see Questions and Answers: Monitoring Influenza Activity, Including 2009 H1N1.

The number of 2009 H1N1 hospitalizations and deaths reported to CDC from April – August 2009 is available on the Past Situation Updates page.

For state level information, refer to state health departments.

International Human Cases of 2009 H1N1 Flu Infection
See:
World Health Organization.

**States report weekly to CDC either 1) laboratory-confirmed influenza hospitalizations and deaths or 2) pneumonia and influenza syndrome-based cases of hospitalization and death resulting from all types or subtypes of influenza. Although only the laboratory confirmed cases are included in this report, CDC continues to analyze data both from laboratory confirmed and syndromic hospitalizations and deaths.

 

U.S. Influenza-associated Pediatric Mortality
Posted November 30, 2009
Data reported to CDC by November 21, 2009
Date Reported
Laboratory-Confirmed 2009 H1N1 Influenza Pediatric Deaths
Laboratory-Confirmed Influenza A Subtype Unknown Pediatric Deaths
Laboratory-Confirmed
Seasonal
Influenza
Total
This Week  (Week 46, November 15-21, 2009) 27 7 1 35
Since August 30, 2009 140 32 0 172
Cumulative since April 26, 2009 198 35 1 234

This table is based on data reported to CDC through the Influenza-Associated Pediatric Mortality Surveillance System. Influenza-associated deaths in children (persons less than 18 years) was added as nationally notifiable condition in 2004.

For more information about influenza-associated pediatric mortality, see FluView.

For more information about the U.S. situation, see the CDC H1N1 Flu U.S. Situation page.

International Situation Update

This report provides an update to the international situation as of November 30, 2009. The World Health Organization (WHO) continues to report laboratory-confirmed 2009 H1N1 flu cases and deaths on its Web page. These laboratory-confirmed cases represent a substantial underestimation of total cases in the world, as many countries focus surveillance and laboratory testing only on people with severe illness. The 2009 H1N1 influenza virus continues to be the dominant influenza virus in circulation in the world. From April 19 to November 14, 2009, 70.5% of influenza specimens reported to WHO were 2009 H1N1 viruses and from November 8 to November 14, 2009, 89.4% of influenza specimens reported to WHO were 2009 H1N1. In temperate regions of the Southern Hemisphere, little disease activity due to 2009 H1N1 has been reported. In tropical regions of the Americas and Asia, influenza activity due to 2009 H1N1 remains variable. In temperate regions of the Northern Hemisphere, influenza-like illness (ILI) activity due to 2009 H1N1 remains high across many countries in Europe, Asia, and North America, though it may have peaked in most areas of the United States and in Canada.

For more information about the international situation, see the CDC H1N1 Flu International Situation page.

Recent Updates of Interest

Additional Updates on the CDC H1N1 Flu Website

To learn about other recent updates made to the CDC H1N1 Flu Website, please check the "What's New" page on the CDC H1N1 Flu website.


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