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CDC H1N1 Flu Website Situation Update, February 28, 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 February 14 -20, 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 decreased this week over last week and remain low. ILI is also looked at by region and three of 10 U.S. regions are reporting elevated ILI. Elevated ILI was seen in regions 1, 4, and 7. Region 1 is comprised of Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont. Region 4 is comprised of Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, and Tennessee. And region 7 is comprised of Iowa, Kansas, Missouri, and Nebraska.
- Laboratory-confirmed hospitalizations rates have leveled off and very few hospitalizations were reported by states during the week ending February 20.
- The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report remains low. However, three flu-related pediatric deaths were reported this week: one death was associated with laboratory-confirmed 2009 H1N1, and the remaining two deaths were associated with infection with an influenza A virus for which the subtype was undetermined. Since April 2009, CDC has received reports of 329 laboratory-confirmed pediatric deaths: 278 due to 2009 H1N1, 49 pediatric deaths that were laboratory confirmed as influenza A, 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. Three states reported regional influenza activity. They are: Alabama, Georgia and South Carolina.
- 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. Some influenza B viruses are circulating at low levels, and these viruses remain similar to the influenza B virus component of the 2009-10 seasonal flu vaccine.
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** | 40,618 | 1,994 | |
| *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 7, February 14, to February 20, 2010) | 1 | 2 | 0 | 3 |
| Since August 30, 2009 | 218 | 46 | 1 | 265 |
| Cumulative since April 26, 2009 | 278 | 49 | 2 | 329 |
| 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 using data collected through February 21, 2010, and reported by the World Health Organization (WHO) on February 26. 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.
Based on FluNet data collected by 32 countries from February 6 - 13, 2010, 48.3% of specimens testing positive for influenza were typed as influenza A and 51.7% as influenza B. In nearly all countries of the world where influenza infection is reported, the 2009 H1N1 influenza virus continues to predominate among all subtyped influenza A viruses. Out of all subtyped influenza A viruses, 90% were 2009 H1N1 positive.
Little flu activity has been reported in the temperate regions of the Southern Hemisphere in 2010 to date. In the temperate regions of the Northern Hemisphere, the 2009 H1N1 influenza virus continues to be detected across many countries. However, influenza activity continues to decline or remain low in most countries. In the Americas, both in the tropical and northern temperate regions, 2009 H1N1 continues to circulate at low levels, but overall influenza activity continues to decline or remain low in most places. In tropical regions of Asia, several countries reported an increasing trend of influenza activity, but overall intensity remains low. The most active areas of influenza transmission are currently in parts of South and Southeast Asia and in certain areas of East and Southeastern Europe.
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 February 20, 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 February 20, 2010
During week 7 (February 14-20, 2010), influenza activity remained at approximately the same levels as last week in the U.S. 185 (4.4%) 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 20, 2010
FluView reports that for the week of February 14 - February 20, 2010, flu activity in the United States was relatively low, 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 is expected to continue for weeks. It's possible that the United States could experience another wave of flu activity caused by either 2009 H1N1 or seasonal influenza. - NEW: Questions and Answers: Underlying Health Conditions Among Adults and Children Hospitalized with 2009 H1N1
Questions and answers related to underlying health conditions among adults and children hospitalized with 2009 H1N1 in the United States from April 2009 through February 16, 2010. - NEW: Questions and Answers: Behavioral Risk Factor Surveillance System (BRFSS) 2009 H1N1 Flu Modules for Influenza-like Illness (ILI) and Vaccination
This page provides a summary of the Behavioral Risk Factor Surveillance System (BRFSS) and how it helps track influenza activity. - NEW: Question & Answer - 2009 H1N1 Impact by Race and Ethnicity
This page provides summary information about the impact of 2009 H1N1 across racial and ethnic groups in the United States. - NEW: Reduction of Inventory and Allocations at the McKesson 2009 H1N1 Vaccine/ Ancillary Supply Distribution Depots
Target audience: State health planners. This document is intended to provide PHER funded grantees with information regarding the reduction of vaccine inventory and allocation at the McKesson 2009 H1N1 vaccine/ancillary supply distribution depots.
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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