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CDC H1N1 Flu Website Situation Update, January 16, 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 3-9, 2010, all key indicators declined compared to the previous week. Below is a summary of the most recent key indicators:
- Visits to doctors for influenza-like illness (ILI) nationally decreased this week over last week. Visits to doctors for ILI also are examined by region. ILI decreased in all 10 regions of the country, but one region (region 9) continues to report elevated activity.
- Overall hospitalization rates are declining.
- The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report decreased over the previous week and remains below what is expected for this time of year. In addition, another seven flu-related pediatric deaths were reported this week: six 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 not determined. Since April 2009, CDC has received reports of 300 laboratory-confirmed pediatric deaths: 255 due to 2009 H1N1, 43 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; a decline of one state from last week. Nine states continue to report regional influenza activity. They are: Alabama, Georgia, Hawaii, Maine, Nevada, New Jersey, New Mexico, New York, 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** | 38,455 | 1,779 | |
| *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 1, January 3, 2009 to January 9, 2010) | 6 | 1 | 0 | 7 |
| Since August 30, 2009 | 195 | 40 | 1 | 236 |
| Cumulative since April 26, 2009 | 255 | 43 | 2 | 300 |
| 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 4, 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 December 13 to December 19, 2009, 87% of influenza specimens reported to WHO were 2009 H1N1, 0.2% were seasonal A (H1), 1.6% were A (H3), 7.7% were influenza A viruses that were not subtyped, and 3.4% were influenza B viruses. In temperate regions of the Southern Hemisphere, sporadic cases of 2009 H1N1 continue to be reported but no sustained community transmission has been observed. In tropical regions of the Americas and Asia, influenza activity due to 2009 H1N1 remains variable. In temperate regions of the Northern Hemisphere, influenza-like illness (ILI) activity due to 2009 H1N1 has returned to baseline or below baseline in North America. Overall, pandemic influenza activity appears to have peaked in most Western European countries but remains active in Central and Eastern European countries. In Western and Central Asia, influenza activity continues to persist above baseline levels.
For more information about the international situation, see the CDC H1N1 Flu International Situation page.
Recent Updates of Interest
- UPDATE: Weekly FluView Map and Surveillance Report for Week Ending January 8, 2010
During week 1 (January 3-9, 2010), influenza activity continued to decrease in the U.S. 139 (3.6%) 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. - MMWR: Interim Results: Influenza A (H1N1) 2009 Monovalent Vaccination Coverage - United States, October - December 2009
Morbidity and Mortality Weekly Report (MMWR) January 15, 2010 / Vol. 59 / Early Release - UPDATED: CDC Estimates of 2009 H1N1 Influenza Cases, Hospitalizations and Deaths in the United States, April - December 12, 2009
CDC has updated its estimates of the total number of 2009 H1N1 cases, hospitalizations and deaths in the United States since April, 2009 - UPDATE: Influenza and Pneumonia-Associated Hospitalizations and Deaths from August 30, 2009 to January 9, 2010
Overall flu activity in the United States decreased during the week of January 3-9, 2010, as reported in FluView. Though flu activity, caused by either 2009 H1N1 or seasonal flu viruses, may rise and fall, it is expected to continue for several more months. Supply and availability of the 2009 H1N1 vaccine have increased dramatically, CDC is now encouraging everyone who has been patiently waiting to receive the 2009 H1N1 vaccine to get vaccinated at this time. - NEW: Q and A: Fraud and Abuse Related to 2009 H1N1 Influenza Vaccine
This document provides information to state/local immunization programs regarding options for reporting certain criminal, fraud and abuse matters relating to the 2009 H1N1 influenza vaccine and ancillary supplies. - AUDIO: 30 second Radio-ready PSA - Vaccinate Against H1N1 Flu
If you think 2009 H1N1 flu can't affect you, your family, or your friends - think again. - AUDIO: 30 second Radio-ready PSA - National Influenza Vaccination Week
National Influenza Vaccination Week (NIVW) is January 10-16, 2010. Learn more. Get vaccinated. - NEW: Open Letter to the American People about the H1N1 Flu Vaccine
In an Open Letter to the American People, over thirty major health care provider and public health organizations encouraged Americans to get the H1N1 vaccine. This letter emphasizes that the H1N1 vaccine is safe, effective, and the best way to protect against the flu.
CDC Experts Contributing to WebMD's Focus on Flu Blog
In collaboration with WebMD, experts from the Centers for Disease Control and Prevention are guest blogging and helping to answer questions on WebMD's Focus on Flu Blog. Check out recent CDC blog post by Kathleen Sebelius, Secretary of the Department of Health and Human Services (HHS) -- It's Not Too Late to Vaccinate.
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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