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CDC H1N1 Flu Website Situation Update, January 31, 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 January 17-23, 2010, most key flu indicators remained about the same as during the previous week. Below is a summary of the most recent key indicators:
- Visits to doctors for influenza-like illness (ILI) nationally are low.
- Overall cumulative hospitalization rates for the 2009-10 influenza season have leveled off in all age groups and very few 2009 H1N1-laboratory confirmed hospitalizations were reported by states during the week ending January 23.
- The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report increased over the previous week and is higher than expected for this time of year. This increase in P&I is thought to result from an increase in reports of pneumonia-associated deaths in older people. These deaths are not necessarily related to flu illness. In addition, another five flu-related pediatric deaths were reported this week: four of these deaths were associated with laboratory confirmed 2009 H1N1, and one death was associated with an influenza A virus for which the subtype was undetermined. Since April 2009, CDC has received reports of 312 laboratory-confirmed pediatric deaths: 262 due to 2009 H1N1, 47 pediatric deaths that were laboratory confirmed as influenza, but the flu virus subtype was not determined, and two 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 influenza activity. Five states reported regional influenza activity. They are: Alabama, Georgia, New Jersey, South Carolina and Virginia.
- Almost all 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
| Cases Defined by | Hospitalizations | Deaths | |
|---|---|---|---|
| Influenza Laboratory-Tests** | 39,387 | 1,857 | |
| *Reports can be based on syndromic, admission or discharge data, or a combination of data elements that could include laboratory-confirmed and influenza-like illness hospitalizations. *Laboratory confirmation includes any positive influenza test (rapid influenza tests, RT-PCR, DFA, IFA, or culture), whether or not typing was done. The table shows aggregate reports of all laboratory confirmed influenza hospitalizations and deaths (including 2009 H1N1 and seasonal flu) since August 30, 2009 received by CDC from U.S. states and territories**. This table will be updated weekly each Friday at 11 a.m. For the 2009-2010 influenza season, states are reporting based on new case definitions for hospitalizations and deaths effective August 30, 2009. CDC will continue to use its traditional surveillance systems to track the progress of the 2009-2010 influenza season. For more information about influenza surveillance, including reporting of influenza-associated hospitalizations and deaths, see Questions and Answers: Monitoring Influenza Activity, Including 2009 H1N1. The number of 2009 H1N1 hospitalizations and deaths reported to CDC from April – August 2009 is available on the Past Situation Updates page. For state level information, refer to state health departments. International Human Cases of 2009 H1N1 Flu Infection **States report weekly to CDC either 1) laboratory-confirmed influenza hospitalizations and deaths or 2) pneumonia and influenza syndrome-based cases of hospitalization and death resulting from all types or subtypes of influenza. Although only the laboratory confirmed cases are included in this report, CDC continues to analyze data both from laboratory confirmed and syndromic hospitalizations and deaths. | |||
| 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 3, January 17 to January 23, 2010) | 4 | 1 | 0 | 5 |
| Since August 30, 2009 | 203 | 44 | 1 | 248 |
| Cumulative since April 26, 2009 | 263 | 47 | 2 | 312 |
| 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 situation as of January 29, 2010. The World Health Organization (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.
The 2009 H1N1 influenza virus continues to be the dominant influenza virus in circulation in the world. For the most recent period in which data are available, from January 10, 2009 to January 16, 2010, 64.4% were typed as influenza A and 35.6% as influenza B. Out of all subtyped influenza A viruses, 95% were 2009 H1N1 positive.
In temperate regions of the Southern Hemisphere, sporadic cases of 2009 H1N1 continue to be reported but no substantial increases in influenza activity have been observed. In the northern temperate and tropical regions of the Americas, 2009 H1N1 activity continues to decrease or remain low in most places. Influenza transmission continues to remain active in North Africa, certain areas of Eastern and Southeastern Europe, and parts of South and East Asia
.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 January 29, 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 January 23, 2010
During week 3 (January 17-23, 2010), influenza activity remained at approximately the same levels this week in the U.S. 164 (4.6%) 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: Influenza and Pneumonia-Associated Hospitalizations and Deaths from August 30, 2009 to January 23, 2010
- MMWR: Outbreaks of 2009 Pandemic Influenza A (H1N1) Among Long-Term--Care Facility Residents --- Three States, 2009
Morbidity and Mortality Weekly Report (MMWR) January 29, 2010 / 59(03);74-77 - UPDATED: Key Facts About 2009 H1N1 Flu Vaccine
This document includes updated information about late season flu vaccination, including who is recommended, where to find vaccine, and why it should still be taken seriously. - UPDATED: Vaccine against 2009 H1N1 Influenza Virus
This document includes updated information about late season flu vaccination, including who is recommended, where to find vaccine, and why it should still be taken seriously. - NEW: Guidance from Pediatric Stakeholders: A Coordinated Approach to Communicating Pediatric-related Information on Pandemic Influenza at the Community Level
This document provides a suggested step-by-step approach to communicating pediatric-related information on pandemic influenza at the community level. The document goal is to provide community planners "talking points" for discussions on a coordinated approach to communication in their community.
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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