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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.
U.S. Situation Update
U.S. Patient Visits Reported for Influenza-like Illness (ILI)
U.S. Influenza-like Illness (ILI) Reported by Regions
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Cases Defined by
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Hospitalizations
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Deaths
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|---|---|---|---|
| Influenza Laboratory-Tests** | 41,689 | 2,096 | |
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*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
**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. |
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Date Reported
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Laboratory-Confirmed 2009 H1N1 Influenza Pediatric Deaths
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Laboratory-Confirmed Influenza A Subtype Unknown Pediatric Deaths
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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 |
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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. |
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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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