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CDC H1N1 Flu Website Situation Update, May 7, 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 25-May 1, 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.
- 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 slightly over last week, and in general, continues to be about what is expected. One pediatric death was reported this week associated with a 2009 H1N1 virus infection. Since April 2009, CDC has received reports of 338 laboratory-confirmed pediatric deaths: 282 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 third consecutive week that no states are reporting widespread or regional flu activity since the week ending December 13, 2008. Most states are reporting no activity or sporadic 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
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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 17, April 21- May 1, 2010) | 1 | 0 | 0 | 1 |
| Since August 30, 2009 | 222 | 50 | 1 | 273 |
| Cumulative since April 26, 2009 | 281 | 53 | 3 | 338 |
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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 May 2, 2010, and reported by the World Health Organization (WHO) on May 7. WHO continues to report laboratory-confirmed 2009 H1N1 flu deaths on its Web page. These fatal cases are an under representation of the actual numbers as many deaths are never tested or recognized as influenza related.
Currently, the most active areas of 2009 H1N1 transmission are in parts of West Africa, the Caribbean, and Southeast Asia. 2009 H1N1 transmission appears to be declining in Ghana after peaking in April. Seasonal B viruses have become more prominent in Cameroon and the Democratic Republic of Congo. In Guatemala, an increasing trend in respiratory disease has been reported in recent weeks. Cuba has noted increased detection of severe 2009 H1N1 cases since March, but overall activity may have peaked the first week of May. Reports of school outbreaks due to 2009 H1N1 continue to occur in Malaysia.
Respiratory disease activity has increased in Bangladesh since mid-April and appears to be due to both 2009 H1N1 and seasonal B viruses. Respiratory disease activity remains low in East Asia, with influenza activity in some countries primarily attributable to seasonal B viruses. Influenza activity in the southern hemisphere is sporadic, though the ILI levels in one region in Chile have been slightly above the epidemic threshold for four weeks. Influenza virus circulation remains low in 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 May 7, 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 May 1, 2010
During week 17 (April 24 - May 1, 2010), influenza activity decreased in the U.S. 16 (0.9%) 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: Questions and Answers about Updating Guidance on Infection Control Measures for Influenza in Healthcare Settings
CDC is updating the Interim Guidance on Infection Control Measures for 2009 H1N1 Influenza in Healthcare Settings, Including Protection of Healthcare Personnel. Circumstances have changed significantly with respect to availability of a safe and effective vaccine, and in terms of what we know about the health impact of the novel H1N1 influenza strain. The guidance is being updated to reflect newer information.
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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