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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 September 20-26, 2009, a review of the key indicators found that influenza activity remained elevated in the United States. Below is a summary of the most recent key indicators:
- Visits to doctors for influenza-like illness (ILI) continued to increase in some areas of the country, and overall, are higher than levels expected for this time of the year.
- Total influenza hospitalization rates for laboratory-confirmed influenza are higher than expected for this time of year for adults and children. And for children 5-17 and adults 18-49 years of age, hospitalization rates from April – September 2009 exceed average flu season rates (for October through April).
- The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report was low and within the bounds of what is expected at this time of year. However, 60 pediatric deaths related to 2009 H1N1 flu have been reported to CDC since April 2009, including 11 deaths reported this week.
- Twenty-seven states are reporting widespread influenza activity at this time. They are: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Delaware, Florida, Georgia, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maryland, Minnesota, Mississippi, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Texas, Tennessee, Virginia, Washington, and Wyoming. Any reports of widespread influenza activity in September are very unusual.
- Almost all of the influenza viruses identified so far are 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.
2009-2010 Influenza Season Triage Algorithm for Adults (>18 Years) With Influenza-Like Illness
This algorithm is designed to assist physicians and those under their supervision in identifying indicators of and responses to symptoms of flu-like illness (i.e., fever with cough or sore throat). (NOTE: this guidance is not intended for use by the general public and is not a substitute for sound clinical judgment.)
Download and print the algorithm (PDF) >>
H1N1 Flu Vaccine Information Statements (VISs)
Vaccine Information Statements (VISs) are information sheets produced by CDC that explain to vaccine recipients, their parents, or their legal representatives both the benefits and risks of a vaccine.
- Inactivated 2009 H1N1 Influenza Vaccine
(the flu shot)
- Live, Intranasal 2009 H1N1 Influenza Vaccine
(the nasal spray vaccine)
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 and Pneumonia Syndrome* | 12,863 | 1,197 | |
| Influenza Laboratory-Tests** | 3,311 | 182 | |
| Totals: | 16,174 | 1,379 | |
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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. This table is based on data from a new influenza and pneumonia hospitalizations and deaths web-based reporting system that will be used to monitor trends in activity. This is the third week of data from this new system. The table shows aggregate reports of all influenza and pneumonia-associated 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
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For more information about the U.S. situation, see the CDC H1N1 U.S. Situation Update page.
International Situation Update
This report provides an update to the international situation as of October 2, 2009. As of October 2, 2009, the World Health Organization (WHO) regions have reported over 343,298 laboratory-confirmed cases of 2009 H1N1 with at least 4,108 deaths, which is an increase of at least 24,373 cases and 191 deaths since September 20. The laboratory-confirmed cases represent a substantial underestimation of total cases in the world, as many 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. From April 19 to September 19, 2009, 59.8% of influenza specimens reported to WHO were 2009 H1N1 viruses. In temperate regions of the Southern Hemisphere, disease due to 2009 H1N1 is declining or has returned to baseline. In tropical regions of the Americas and Asia, influenza activity due to 2009 H1N1 remains variable. In temperate regions of the Northern Hemisphere, there is increased influenza-like illness (ILI) activity due to 2009 H1N1 in many areas, including in most of the United States, parts of Mexico and Canada, some countries in Europe, and parts of Central and Western Asia.
For more information about the international situation, see the CDC H1N1 International Situation Update page.
Recent Updates of Interest
- 2009-2010 Influenza Season Triage Algorithm for Adults (>18 Years) With Influenza-Like Illness (PDF)
This algorithm is designed to assist physicians and those under their supervision in identifying indicators of and responses to symptoms of flu-like illness (i.e., fever with cough or sore throat). (NOTE: this guidance is not intended for use by the general public and is not a substitute for sound clinical judgment.) - Update: 2009 H1N1 Influenza Shots and Pregnant Women: Questions and Answers for Patients
Why does CDC advise pregnant women to receive the 2009 H1N1 influenza (flu) vaccine (shot)? Will the seasonal flu shot also protect against the 2009 H1N1 flu? Are there flu vaccines that pregnant women should not get? More... - 2009 H1N1 Influenza Vaccine and Pregnant Women: Information for Healthcare Providers
Where can healthcare providers obtain 2009 H1N1 flu vaccine? How should healthcare providers organize their clinics for vaccination? How many vaccine doses will a pregnant woman need to get? More... - Weekly FluView Map and Surveillance Report for Week Ending September 26, 2009
During week 38 (September 20-26, 2009), influenza activity remained stable in the United States; however, there were still higher levels of influenza-like illness than is normal for this time of year. - Update: H1N1 Clinicians Questions and Answers
The age for two doses is different for seasonal (6 months through 8 years) and 2009 H1N1 monovalent vaccine (6 months through 9 years) in the package inserts. Does CDC recommend that clinicians follow the recommendation in the package inserts? Can a person who has received LAIV test positive on a rapid influenza diagnostic test? And more... - Vaccine Information Statement (VIS) for Inactivated 2009 H1N1 Influenza Vaccine (PDF)
Explains to vaccine recipients, their parents, or their legal representatives both the benefits and risks of the vaccine. - Vaccine Information Statement (VIS) for Live, Intranasal 2009 H1N1 Influenza Vaccine (PDF)
Explains to vaccine recipients, their parents, or their legal representatives both the benefits and risks of the vaccine. - Audio and Transcript for October 1 CDC Press Briefing
Weekly 2009 H1N1 Flu Media Briefing - U.S. Influenza and Pneumonia-Associated Hospitalizations and Deaths from September 20-26, 2009
As of 11:00 AM ET on October 2, 2009, CDC is reporting 16,174 hospitalizations and 1,379 deaths. This reports all influenza and pneumonia-associated hospitalizations and deaths (including 2009 H1N1 and seasonal flu) since August 30, 2009 received by CDC from U.S. states and territories. - 2009 H1N1 Flu: International Situation Update
This report provides an update to the international situation as of October 2, 2009. As of October 2, 2009, the World Health Organization (WHO) regions have reported over 343,298 laboratory-confirmed cases of 2009 H1N1 with at least 4,108 deaths. - Questions and Answers on 2009 H1N1 Vaccine Financing
Considerations of financing distinguish between those related to the vaccine itself, the ancillary supplies needed to administer the vaccine, and the actual administration of the vaccine. - Preparing for the Flu: A Communication Toolkit for the Federal Workforce
The purpose of Preparing for the Flu: A Communication Toolkit for the Federal Workforce is to provide information and communication resources to help federal agencies and employees implement recommendations from CDC in planning and responding to the 2009–2010 Influenza Season. - 2009 H1N1 Influenza Vaccine and Seniors
Questions and Answers about 2009 H1N1 Influenza Vaccine and Seniors - Interim Recommendations for Clinical Use of Influenza Diagnostic Tests During the 2009-10 Influenza Season
To provide updated interim recommendations on influenza diagnostic testing for clinicians treating patients with suspected 2009 H1N1 influenza virus infection and to assist clinicians with testing decisions for the 2009-10 influenza season. - Questions & Answers: Influenza Diagnostic Testing During the 2009-2010 Flu Season - For the Public
How will I know if I have the flu this season? How can I know for certain if I have the flu this season? What kinds of flu tests are there? More... - Questions & Answers: Interim Recommendations for Clinical Use of Influenza Diagnostic Testing During the 2009-2010 Influenza Season - For Health Care Providers
What does CDC recommend this season regarding testing for influenza? What is the reason for these recommendations? Does CDC recommend diagnostic testing for patients with uncomplicated illness from suspected influenza infection? More...
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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