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CDC H1N1 Flu Website Situation Update, February 14, 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 31 – February 6, 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 increased slightly over last week but remain low overall. The national increase in ILI was driven by elevated ILI in 3 of 10 U.S. regions. Regions 4, 7, and 9 reported ILI slightly higher than average for the United States. Region 4 is comprised of Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina and Tennessee. Region 7 is comprised of Iowa, Kansas, Missouri and Nebraska, and region 9 is comprised of Arizona, California, Hawaii and Nevada.
- Very few 2009 H1N1 laboratory-confirmed hospitalizations were reported by states during the week ending February 6 for most age groups.
- The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report decreased over the previous week and is now lower than expected for this time of year. In addition, another three flu-related pediatric deaths were reported this week: two 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 324 laboratory-confirmed pediatric deaths: 274 due to 2009 H1N1, 48 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. Six states reported regional influenza activity. They are: Alabama, Georgia, Maine, New Jersey, New Mexico, and South Carolina.
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.
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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Cases Defined by
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Hospitalizations
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Deaths
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|---|---|---|---|
| Influenza Laboratory-Tests** | 40,030 | 1,937 | |
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*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. |
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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 5, January 31 to February 6, 2010) | 2 | 1 | 0 | 3 |
| Since August 30, 2009 | 214 | 45 | 1 | 260 |
| Cumulative since April 26, 2009 | 274 | 48 | 2 | 324 |
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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 situation as of January 31, 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 17, 2009 to January 23, 2010, 54% were typed as influenza A and 46% as influenza B. Out of all subtyped influenza A viruses, 93% 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
- UPDATED: CDC Estimates of 2009 H1N1 Influenza Cases, Hospitalizations and Deaths in the United States, April 2009 - January 16, 2010
CDC has updated its estimates of the total number of 2009 H1N1 cases, hospitalizations and deaths in the United States since April, 2009. - UPDATE: Weekly FluView Map and Surveillance Report for Week Ending February 6, 2010
During week 5 (January 31-February 6, 2010), influenza activity remained at approximately the same levels as last week in the U.S. 206 (4.8%) 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 February 6, 2010
FluView reports that for the week of January 31 - February 6, 2010, flu activity in the United States remained about the same as during the previous week. Flu activity is relatively low at this time, with most flu continuing to be caused by 2009 H1N1. Flu activity, caused by either 2009 H1N1 or seasonal flu viruses, may rise and fall, but it is expected to continue for several more months. - NEW: 2009 H1N1 and Seasonal Influenza and Hispanic Communities: Questions and Answers
These questions and answers summarize the current understanding of the impact of 2009 H1N1 and seasonal influenza virus on Hispanics/Latinos, describe some of the barriers to uptake of 2009 H1N1 and seasonal influenza vaccines, and outline potential strategies for improving health and increasing vaccine coverage in Hispanic/Latino communities. - NEW: Abbreviated Pandemic Influenza Plan Template for Primary Care Provider Offices: Guidance from Stakeholders (PDF)
The abbreviated Primary Care Office Template was developed by SMEs in primary care, public health and emergency management during a stakeholder meeting in August 2009. Utilizing this template, primary care offices will be able to rapidly (within 1-5 days) develop a pandemic influenza plan and be encouraged to become integrated into community planning.
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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