CDC H1N1 Flu Website Situation Update, February 21, 2010

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Title: CDC H1N1 Flu Website Situation Update, February 21, 2010

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CDC H1N1 Flu Website Situation Update, February 21, 2010 

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 February 7 – February 13, 2010, most key flu indicators remained about the same as during the previous week. 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

Laboratory Confirmed Influenza-Associated Hospitalizations
and Deaths from August 30 2009 to February 13, 2010

Posted February 19, 2010, 11:00 AM ET
Data reported to CDC by February 16, 2010, 12:00 AM ET
Cases Defined by
Hospitalizations
Deaths
Influenza Laboratory-Tests** 40,302 1,966

*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 February 19, 2010 (Updated Weekly)
Data reported to CDC by February 13, 2010
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 6, February 7, to February 13, 2010) 2 0 0 2
Since August 30, 2009 217 44 1 262
Cumulative since April 26, 2009 277 47 2 326

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 using data collected through February 14, 2010, and reported by the World Health Organization (WHO) on February 19. 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 most countries focus surveillance and laboratory testing only on people with severe illness.

In nearly all countries of the world where influenza infection is reported, the 2009 H1N1 influenza virus continues to predominate among all subtyped influenza A viruses. Based on FluNet data collected by 27 countries from January 31, 2010 to February 6, 2010, 93% of specimens testing positive for influenza were typed as influenza A and 7% as influenza B.  Out of all subtyped influenza A viruses, 97% were 2009 H1N1 positive.

In temperate regions of the Southern Hemisphere, sporadic cases of 2009 H1N1 continue to be reported but no substantial increases in influenza activity have been observed. In the temperate Northern Hemisphere, active but declining 2009 H1N1 influenza transmission persists in certain areas of Eastern and Southern Europe, South Asia, and East Asia. In tropical regions of Asia, several countries reported an increasing trend of influenza activity but overall intensity remains low. An increasing trend in influenza activity was reported by several countries in West Africa, Thailand, and Jamaica. 

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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