CDC H1N1 Flu Website Situation Update, May 21, 2010

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Title: CDC H1N1 Flu Website Situation Update, May 21, 2010

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CDC H1N1 Flu Website Situation Update, May 21, 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 May 9-May 15, 2010, nationally all key flu indicators are low. Activity levels at this time are similar to what is usually seen during the U.S. summer months. Below is a summary of the most recent key indicators:

• Visits to doctors for influenza-like illness (ILI) decreased 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 remained about the same as last week. No pediatric deaths were associated with flu were reported this week. Since April 2009, CDC has received reports of 338 flu 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 fifth consecutive week that no states reported widespread or regional flu activity. 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.

Learn more >> 

U.S. Situation Update

Weekly Flu Activity Estimates

U.S. Patient Visits Reported for Influenza-like Illness (ILI)

U.S. Influenza-like Illness (ILI) Reported by Regions

U.S. Influenza-associated Pediatric Mortality
Posted May 21, 2010 (Updated Weekly)
Data reported to CDC by May 15, 2010

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 19, May 9 - May 15, 2010)	0	0	0	0
Since August 30, 2009	222	50	1	273
Cumulative since April 26, 2009	282	53	3	338
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 16, 2010, and reported by the World Health Organization (WHO) on May 21.

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, South America, and Southeast Asia. Seasonal influenza B viruses, in addition to 2009 H1N1, are being reported in parts of Southeast Asia.  Influenza B viruses are the main influenza viruses in East Asia. 

Influenza activity is relatively low in most parts of the temperate northern and southern hemispheres, except for Chile, which has localized increases in ILI.  Both 2009 H1N1 and seasonal B viruses are being detected in Europe.  Transmission of 2009 H1N1 in Sub-Saharan Africa appears to have dropped markedly.

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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