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CDC H1N1 Flu Website Situation Update, May 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 April 18-24, 2010, nationally all key flu indicators declined 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.
- The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report decreased over last week, and in general, continues to be about what is expected. 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 second consecutive week that no states are reporting widespread or regional flu activity since the week ending December 13, 2008.
- 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.
U.S. Situation Update
U.S. Patient Visits Reported for Influenza-like Illness (ILI)
U.S. Influenza-like Illness (ILI) Reported by Regions
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 25, 2010, and reported by the World Health Organization (WHO) on April 30. 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, and South and Southeast Asia. Localized flu activity due to 2009 H1N1 continues to occur in tropical regions of the Americas. Overall, influenza activity remains low in the Northern Hemisphere. In Europe, the total number of influenza B virus detections (79.1%) exceeded that of influenza A viruses (20.9%), with seven countries reporting influenza B as the dominant type of influenza virus in circulation. In the temperate zone of the Southern Hemisphere, influenza-like illness (ILI) activity remains low. In Australia, 2009 H1N1, seasonal influenza B and influenza A (H3N2) viruses have been reported sporadically. Influenza type B virus is the predominant influenza virus in East Asia and Northern and Eastern Europe, and is circulating at low levels across Central and West Africa. Flu activity due to influenza A (H3N2) viruses continues to be reported in South and Southeast Asia, as well as in some countries of Central and 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 30, 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 24, 2010
During week 16 (April 18-24, 2010), influenza activity decreased in the U.S.16 (1.2%) 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.
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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