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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.
U.S. Situation Update
U.S. Patient Visits Reported for Influenza-like Illness (ILI)
U.S. Influenza-like Illness (ILI) Reported by Regions
| 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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