CDC H1N1 Flu Website Situation Update - April 23, 2010

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CDC H1N1 Flu Website Situation Update, April 23, 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 April 11-17, 2010, nationally most key flu indicators declined slightly from the previous week. Overall, influenza activity is low in the United States. Below is a summary of the most recent key indicators:

• Visits to doctors for influenza-like illness (ILI) declined from last week and are low nationally, with all 10 U.S. regions reporting ILI below region-specific baseline levels.
• Laboratory-confirmed hospitalizations rates have leveled off and very few hospitalizations were reported by states during the week ending April 17.
• The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report increased over last week, but in general, are not higher than expected. Also, this indicator can lag behind the others. No pediatric deaths were reported this week. Since April 2009, CDC has received reports of 337 laboratory-confirmed pediatric deaths: 281 due to 2009 H1N1, 53 pediatric deaths that were laboratory confirmed as influenza A, but the flu virus subtype was not determined, and three pediatric deaths that were associated with seasonal influenza viruses. (Laboratory-confirmed deaths are thought to represent an undercount of the actual number. CDC has provided estimates about the number of 2009 H1N1 cases and related hospitalizations and deaths).
• No states reported widespread or regional influenza activity. This is the first week since the week ending December 13, 2008 that no states are reporting widespread or regional flu activity.
• The majority of the influenza viruses identified so far continue to be 2009 H1N1 influenza A viruses. These viruses remain similar to the virus chosen for the 2009 H1N1 vaccine and remain susceptible to the antiviral drugs oseltamivir and zanamivir with rare exception.

*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. Influenza-associated Pediatric Mortality
Posted April 23, 2010 (Updated Weekly)
Data reported to CDC by April 17, 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 15, April 11- April 17, 2010)	0	0	0	0
Since August 30, 2009	221	50	1	272
Cumulative since April 26, 2009	281	53	3	337
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 flu situation using data collected through April 18, 2010, and reported by the World Health Organization (WHO) on April 23. 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.

Currently, the most active areas of 2009 H1N1 transmission are in parts of West and Central Africa. Influenza activity is still widely circulating in Southeast Asia and Central America.Overall, influenza activity remains low in the Northern Hemisphere. In the temperate zone of the Southern Hemisphere, Chile reported increases in ILI activity for the past four weeks. In Australia and New Zealand, there is no evidence yet of the start of transmission of influenza viruses.  Influenza type B viruses are now the predominant circulating influenza viruses across East Asia, Central Africa and Northern and Eastern Europe. Very small numbers of type B viruses have also been detected in Central America. Seasonal influenza H3N2 activity is still being reported in South and Southeast Asia, as well as in several countries of West Africa and Eastern Europe.

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

Recent Updates of Interest

• UPDATE: 2009 H1N1 Flu International Situation Update
  This report provides an update to the international situation as of April 23, 2010. The World Health Organization (WHO) continues to report updated 2009 H1N1 flu-associated laboratory-confirmed cases and deaths on its Web page.
• UPDATE: Weekly FluView Map and Surveillance Report for Week Ending April 17, 2010
  During week 15 (April 11-17, 2010), influenza activity decreased in the U.S. 37 (2.1%) 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.
• NEW: Question & Answer: 2009 H1N1 and Pregnancy
  This document provides updated information on pregnancy as a risk factor for serious 2009 H1N1-related complications based on findings from a recent study.
• UPDATE: CDC estimates of 2009 H1N1 related cases, hospitalizations and deaths in the United States from April 2009 - March 13, 2010.
  CDC has again updated its estimates of the total number of 2009 H1N1 cases, hospitalizations and deaths in the United States since April, 2009. The new estimates incorporate an additional four weeks of flu data from the previous estimates released on March 12, 2010.

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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CDC H1N1 Flu Website Situation Update, April 16, 2010

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CDC H1N1 Flu Website Situation Update, April 16, 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 April 4-10, 2010, nationally most key flu indicators declined slightly from the previous week. Overall, influenza activity is low in the United States. Below is a summary of the most recent key indicators:

• Visits to doctors for influenza-like illness (ILI) declined from last week and are low nationally, with all 10 U.S. regions reporting ILI below region-specific baseline levels.
• Laboratory-confirmed hospitalizations rates have leveled off and very few hospitalizations were reported by states during the week ending April 10; however, in recent prior weeks, some states – mostly in the Southeast of the country – had been reporting increases in the number of flu-related hospitalizations.
• The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report decreased over last week and is still below baseline. Three pediatric deaths were reported this week. One was associated with 2009 influenza A (H1N1) virus, one was associated with an unsubtyped influenza A virus, and one was associated with a seasonal influenza A (H1) virus, but occurred during the 2008-09 season. Since April 2009, CDC has received reports of 337 laboratory-confirmed pediatric deaths: 281 due to 2009 H1N1, 53 pediatric deaths that were laboratory confirmed as influenza A, but the flu virus subtype was not determined, and three pediatric deaths that were associated with seasonal influenza viruses. (Laboratory-confirmed deaths are thought to represent an undercount of the actual number. CDC has provided estimates about the number of 2009 H1N1 cases and related hospitalizations and deaths).
• No states reported widespread influenza activity. Two states continue to report regional influenza activity. They are: Alabama and Georgia. Local and regional flu activity has been sustained in most of the Southeast over the past several weeks.
• The majority of the influenza viruses identified so far continue to be 2009 H1N1 influenza A viruses. These viruses remain similar to the virus chosen for the 2009 H1N1 vaccine and remain susceptible to the antiviral drugs oseltamivir and zanamivir with rare exception.

*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

As of April 16, 2010, the Aggregate Hospitalizations and Deaths Reporting Activity (AHDRA) has concluded for the 2009-2010 flu season. The AHDRA surveillance system was created specifically in response to the 2009 H1N1 pandemic, and the system will be maintained for quick implementation in the event of another flu pandemic. CDC will continue to track hospitalizations and deaths through its traditional seasonal flu surveillance systems during the 2010-2011 season. Pneumonia and influenza-related deaths in adults and children will be tracked through the 122 Cities Mortality Reporting System. Laboratory confirmed, flu-related deaths in children will continue to be tracked through the Influenza-associated Pediatric Mortality Surveillance system. Laboratory confirmed, flu-related hospitalizations in adults and children will be tracked through the Emerging Infections Program (EIP).

 

U.S. Influenza-associated Pediatric Mortality
Posted April 16, 2010 (Updated Weekly)
Data reported to CDC by April 10, 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 14, April 4 - April 10, 2010)	1	1	1	3
Since August 30, 2009	221	50	1	272
Cumulative since April 26, 2009	281	53	3	337
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 flu situation using data collected through April 11, 2010, and reported by the World Health Organization (WHO) on April 16. 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.

Currently, 2009 H1N1 flu activity is highest in parts of Southeast Asia, West and Eastern Africa, and the tropical regions of the Americas. Overall, influenza activity remains low in the Northern Hemisphere, and at this time, little influenza activity has been reported in the Southern Hemisphere. Seasonal influenza B viruses continue to circulate as the predominant influenza subtype in East Asia and have been detected at low levels across parts of Europe. Sporadic detections of seasonal influenza A (H3N2) viruses have been reported across Asia, Eastern Europe, and Eastern Africa. In recent weeks, the highest H3N2 influenza activity has been reported in Indonesia and Tanzania.

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

Recent Updates of Interest

• UPDATE: 2009 H1N1 Flu International Situation Update
  This report provides an update to the international situation as of April 16, 2010. The World Health Organization (WHO) continues to report updated 2009 H1N1 flu-associated laboratory-confirmed cases and deaths on its Web page.
• UPDATE: Weekly FluView Map and Surveillance Report for Week Ending April 10, 2010
  During week 14 (April 4-10, 2010), influenza activity decreased in the U.S. 52 (2.7%) 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.
• UPDATE: Influenza and Pneumonia-Associated Hospitalizations and Deaths from August 30, 2009 to April 3, 2010
  As of April 16, 2010, the Aggregate Hospitalizations and Deaths Reporting Activity (AHDRA) has concluded for the 2009-2010 flu season. The AHDRA surveillance system was created specifically in response to the 2009 H1N1 pandemic, and the system will be maintained for quick implementation in the event of another flu pandemic. CDC will continue to track hospitalizations and deaths through its traditional seasonal flu surveillance systems during the 2010-2011 season. Pneumonia and influenza-related deaths in adults and children will be tracked through the 122 Cities Mortality Reporting System. Laboratory confirmed, flu-related deaths in children will continue to be tracked through the Influenza-associated Pediatric Mortality Surveillance system. Laboratory confirmed, flu-related hospitalizations in adults and children will be tracked through the Emerging Infections Program (EIP).
• MMWR UPDATE: Influenza Activity --- United States, August 30, 2009 - March 27, 2010, and Composition of the 2010 - 11 Influenza Vaccine
  Morbidity and Mortality Weekly Report (MMWR) April 16, 2010 / 59(14);423-430

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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CDC H1N1 Flu Website Situation Update, April 9, 2010

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CDC H1N1 Flu Website Situation Update, April 9, 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 March 28-April 3, 2010, nationally most key flu indicators declined slightly from the previous week. Overall, influenza activity is low in the United States. Below is a summary of the most recent key indicators:

• Visits to doctors for influenza-like illness (ILI) declined from last week and are low nationally with all 10 U.S. regions seeing declining or stable ILI. (Last week, Region 9 -- the Southwest and Hawaii -- had elevated ILI.)
• Laboratory-confirmed hospitalizations rates have leveled off and very few hospitalizations were reported by states during the week ending April 3; however, in recent prior weeks, some states – mostly in the Southeast of the country – had been reporting increases in the number of flu-related hospitalizations.
• The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report decreased over last week and is now below baseline. One flu-related pediatric death was reported this week associated with an unsubtyped influenza A virus. Since April 2009, CDC has received reports of 334 laboratory-confirmed pediatric deaths: 280 due to 2009 H1N1, 52 pediatric deaths that were laboratory confirmed as influenza A, but the flu virus subtype was not determined, and two pediatric deaths that were associated with seasonal influenza viruses. (Laboratory-confirmed deaths are thought to represent an undercount of the actual number. CDC has provided estimates about the number of 2009 H1N1 cases and related hospitalizations and deaths).
• No states reported widespread influenza activity. Three states continue to report regional influenza activity. They are: Alabama, Georgia and South Carolina. Local and regional flu activity has been sustained in most of the Southeast over the past several weeks.
• The majority of the influenza viruses identified so far continue to be 2009 H1N1 influenza A viruses. These viruses remain similar to the virus chosen for the 2009 H1N1 vaccine and remain susceptible to the antiviral drugs oseltamivir and zanamivir with rare exception.

*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 April 3, 2010
Posted April 9, 2010, 11:00 AM ET
Data reported to CDC by April 6, 2010, 12:00 AM ET

Cases Defined by	Hospitalizations	Deaths
Influenza Laboratory-Tests**	41,821	2,117
*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 April 9, 2010 (Updated Weekly)
Data reported to CDC by April 3, 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 13, March 28 - April 3, 2010)	0	1	0	1
Since August 30, 2009	220	49	1	270
Cumulative since April 26, 2009	280	52	2	334
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 flu situation using data collected through April 4, 2010, and reported by the World Health Organization (WHO) on April 9. 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.

Currently, 2009 H1N1 flu activity is highest in parts of Southeast Asia, West Africa, and the tropical regions of the Americas. In the temperate areas of the Northern and Southern Hemisphere, 2009 H1N1 virus continues to circulate at low levels. Seasonal influenza B viruses continue to circulate in East Asia and have been detected at low levels across parts of Asia and Europe. Seasonal influenza A (H3N2) viruses continue to be reported occasionally across Asia, Africa, Australia, and the Americas. However, the highest H3N2 virus activity has been reported in Indonesia.

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

Recent Updates of Interest

• UPDATE: 2009 H1N1 Flu International Situation Update
  This report provides an update to the international situation as of April 9, 2010. The World Health Organization (WHO) continues to report updated 2009 H1N1 flu-associated laboratory-confirmed cases and deaths on its Web page.
• UPDATE: Weekly FluView Map and Surveillance Report for Week Ending April 3, 2010
  During week 13 (March 28-April 3, 2010), influenza activity decreased slightly in the U.S. 105 (3.7%) 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.
• UPDATE: Influenza and Pneumonia-Associated Hospitalizations and Deaths from August 30, 2009 to April 3, 2010
  Flu activity in the United States declined slightly from last week and is low nationally; however, some states in the Southeast continue to report regional activity, according to the March 28-April 3, 2010 FluView. Most flu continues to be 2009 H1N1. Flu activity, caused by either 2009 H1N1 or seasonal flu viruses, may rise and fall, but is expected to continue for weeks in the U.S. Internationally, 2009 H1N1 flu is still circulating, including in the Southern Hemisphere, which is about to enter its flu season. For more information, please see the international situation update.
• NEW: 5 Things Caregivers of People with Disabilities Need To Know About the Flu
  If you provide care for a person with a disability either at home or in a community-based setting, read the 5 Things Caregivers of People with Disabilities Need to Know about the Flu.
• NEW: 5 Things People with Disabilities Need To Know About the Flu
  If you are a person with a disability, read the 5 Things People with Disabilities Need to know about the Flu.
• NEW: Interim Results: State-Specific Influenza A (H1N1) 2009 Monovalent Vaccination Coverage
  Morbidity and Mortality Weekly Report (MMWR) April 2, 2010 / 59(12); 363-368.
• NEW: Interim Results: Influenza A (H1N1) 2009 Monovalent and Seasonal Influenza Vaccination Coverage Among Health-Care Personnel --- United States, August 2009--January 2010
  Morbidity and Mortality Weekly Report (MMWR) April 2, 2010 / 59(12);357-362.

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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CDC H1N1 Flu Website Situation Update, April 2, 2010

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CDC H1N1 Flu Website Situation Update, April 2, 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 March 21-27, 2010, nationally most key flu indicators remained about the same as during the previous week; however, increasing activity has been reported in certain areas. Below is a summary of the most recent key indicators:

• Visits to doctors for influenza-like illness (ILI) remained stable and relatively low nationally. However, ILI is also looked at by region, and one of 10 U.S. regions, region 9, reported elevated ILI for the week ending March 27. Region 9 is comprised of Arizona, California, Hawaii and Nevada. (Last week, regions 4, 7 and 9 had elevated ILI.)
• Laboratory-confirmed hospitalizations rates have leveled off and very few hospitalizations were reported by states during the week ending March 27; however, some states in the Southeast are reporting recent increases in the number of flu-related hospitalizations.
• The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report increased over last week and is now above baseline. One flu-related pediatric death was reported this week, and it was associated with 2009 H1N1. Since April 2009, CDC has received reports of 333 laboratory-confirmed pediatric deaths: 279 due to 2009 H1N1, 52 pediatric deaths that were laboratory confirmed as influenza A, but the flu virus subtype was not determined, and two pediatric deaths that were associated with seasonal influenza viruses. (Laboratory-confirmed deaths are thought to represent an undercount of the actual number. CDC has provided estimates about the number of 2009 H1N1 cases and related hospitalizations and deaths).
• No states reported widespread influenza activity. Three states reported regional influenza activity. They are: Alabama, Georgia and South Carolina. Local and regional flu activity has been sustained in the Southeast United States over the past several weeks.
• The majority of the influenza viruses identified so far continue to be 2009 H1N1 influenza A viruses. These viruses remain similar to the virus chosen for the 2009 H1N1 vaccine and remain susceptible to the antiviral drugs oseltamivir and zanamivir with rare exception.

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 March 27, 2010
Posted April 2, 2010, 11:00 AM ET
Data reported to CDC by March 30, 2010, 12:00 AM ET

Cases Defined by	Hospitalizations	Deaths
Influenza Laboratory-Tests**	41,689	2,096
*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 April 2, 2010 (Updated Weekly)
Data reported to CDC by March 27, 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 12, March 20-27, 2010)	1	0	0	1
Since August 30, 2009	219	49	1	269
Cumulative since April 26, 2009	279	52	2	333
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 flu situation using data collected through March 28, 2010, and reported by the World Health Organization (WHO) on April 1. 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.

Currently, 2009 H1N1 influenza activity is highest in the tropical regions of Asia, the Americas and Africa. In the temperate areas of the Northern and Southern Hemisphere, 2009 H1N1 influenza virus continues to circulate at low levels. Although the 2009 H1N1 virus continues to be the predominant influenza virus circulating worldwide, influenza B viruses are predominant in most of East Asia and have been detected at low levels across Southeast and Western Asia, East Africa, and parts of Eastern and Northern Europe. Seasonal influenza A viruses are still being detected in parts of Asia and Australia.

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

Recent Updates of Interest

• UPDATE: Weekly FluView Map and Surveillance Report for Week Ending March 27, 2010
  During week 12 (March 20-27, 2010), influenza activity remained at approximately the same levels as last week in the U.S. 97 (3.5%) 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.
• UPDATE: 2009 H1N1 Flu International Situation Update
  This report provides an update to the international situation as of April 2, 2010. The World Health Organization (WHO) continues to report updated 2009 H1N1 flu-associated laboratory-confirmed cases and deaths on its Web page.
• UPDATE: Influenza and Pneumonia-Associated Hospitalizations and Deaths from August 30, 2009 to March 27, 2010
  Although flu activity remains relatively low nationally, the Southeast United States is experiencing continued regional activity, according to the March 21-27, 2010 FluView. Most flu continues to be 2009 H1N1. Flu activity, caused by either 2009 H1N1 or seasonal flu viruses, may rise and fall, but is expected to continue for weeks in the U.S. Internationally, 2009 H1N1 flu is still circulating, including in the Southern Hemisphere, which is about to enter its flu season. For more information, please see the international situation update.
• Travel and 2009 H1N1 Vaccine
  NEW: This page provides information and links for travelers who want to reduce their risk of becoming sick with 2009 H1N1
• NEW: Press Briefing Transcript - CDC 2009 H1N1 Flu Media Briefing (Rough Transcript)
  Transcript for March 29, 2010 telebriefing. Surgeon General Regina M. Benjamin, M.D., M.B.A. Anne Schuchat, M.D., Director, National Center for Immunization and Respiratory Diseases. "We are continuing to see people with serious illness from the pandemic H1N1 virus, especially in some of the southeastern states, and vaccination is the best way to protect yourself and those you love from further illness or death and..."
• UPDATE: 2009 H1N1 Virus Images
  3D graphical representations of the biology and structure of a generic influenza virus.

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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Sign up to get health updates sent via text message. Messages are sent about three times a week with relevant H1N1 flu updates and timely health tips.

Text UPDATES to 87000 to sign up.

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