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CDC H1N1 Flu Website Situation Update, May 28, 2010
NOTE: This is the final weekly H1N1 situation update.
The final CDC influenza activity report for the 2009-10 season is being published on May 28, 2010. While influenza surveillance takes place year-round, official reporting (FluView publication) routinely happens between October and May to coincide with normally occurring influenza activity in the United States. In the absence of unusual influenza activity over the summer of 2010, the final FluView and related updates of the 2009 H1N1 website will appear on May 28, 2010.The 2009 H1N1 situation updates and other 2009 H1N1 webpages will be archived for historical purposes.
Key Flu Indicators
Each week, year-round, CDC analyzes information about influenza disease activity in the United States. Findings of key flu indicators are published in a report called FluView from October through mid-May to coincide with typical seasonal influenza activity in the United States. During the week of May 16–22, 2010, (the final FluView for the 2009-2010 influenza season) nationally all key flu indicators are low. Below is a summary of the final key indicators. Reporting for the 2010-2011 influenza season will resume in October and appear on the seasonal influenza website.
- Visits to doctors for influenza-like illness (ILI) stayed about the same as last week and are low nationally, with all 10 U.S. regions reporting ILI below region-specific baseline.
- By the end of April flu hospitalizations had returned to expected levels and, as is customary, hospital reporting was suspended at the end of April. Hospital reporting will resume in October.
- The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report is at about what is normally seen during the summer. Three pediatric deaths associated with 2009 H1N1 flu were reported this week. Since April 2009, CDC has received reports of 341 flu laboratory-confirmed pediatric deaths: 285 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. During the regular 2009-2010 influenza season (October to May), 276 pediatric deaths were reported to CDC. All but one were 2009 H1N1-related. (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 sixth consecutive week that no states reported widespread or regional flu activity. Most states are reporting no activity or sporadic activity. This is typical for May during non-pandemic years.
- 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 20, May 16- May 22, 2010) | 3 | 0 | 0 | 3 |
| Since August 30, 2009 | 225 | 50 | 1 | 276 |
| Cumulative since April 26, 2009 | 285 | 53 | 3 | 341 |
| 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 May 23, 2010, and reported by the World Health Organization (WHO) on May 28.
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.
The most active areas of 2009 H1N1 influenza transmission are in the tropical regions of the Caribbean and Southeast Asia. In the tropical regions of South America, 2009 H1N1 and seasonal influenza viruses continue to co-circulate at low levels. Influenza B has been reported at low but increasing levels in certain South American countries.
Influenza activity is low in most parts of the temperate Northern and Southern hemispheres, except for Chile, which has localized areas of 2009 H1N1 influenza activity. Intermittent detections of seasonal influenza A (H3N2) and 2009 H1N1 influenza viruses have been recently reported in Australia. In the European region, influenza activity is low and at levels normally seen during the summer. In addition, a low percentage (4.5%) of respiratory specimens collected in the European region through May 23, 2010, and submitted for laboratory testing have tested positive for influenza. Of the 80 influenza virus detections reported this week, 86% were influenza B. In Sub-Saharan Africa, 2009 H1N1 influenza activity in West Africa has now largely subsided.
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 21, 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 15, 2010
During week 19 ( May 9 - 15, 2010), influenza activity decreased in the U.S. 14 (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: CDC Guidance for Day and Residential Camp Responses to Influenza during the 2010 Summer Camp Season
This document provides guidance to help prevent and control the spread of influenza (flu), including 2009 H1N1 flu, among campers and camp staff during the 2010 summer camp season. This guidance updates the earlier camp guidance on "novel influenza A (H1N1 flu) virus" that was issued on June 14, 2009.
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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