NOTE:This page is not intended as a stand-alone Web document and is intended to serve merely as a Sección 508-accessible version of the PowerPoint presentation "2009 H1N1: Overview of a Pandemic, April 2009 - August 2010."
2009 H1N1: Overview of a Pandemic
Impact of 2009 H1N1
Global Impact
- More than 214 countries and overseas territories or communities had reported laboratory confirmed cases of pandemic influenza H1N1 2009, including at least 18,449 deaths (World Health Organization, August 6, 2010)
- Reported cases and deaths are likely a substantial under-estimate of true impact of 2009 H1N1
- Estimating the true number of individual flu cases and deaths is very challenging
- Many people with flu don’t seek medical care
- Only a small number of those that do seek care are tested
- More people who are hospitalized or die of flu-related causes are tested and reported, but under-reporting of hospitalizations and deaths occurs as well
Impact of 2009 H1N1 Flu
Domestic Impact
Characteristics of 2009 H1N1 Influenza
April 15, 2009 to April 10, 2010
![This slide shows the characteristics of 2009 H1N1 from April 15, 2009 to April 10, 2010](https://webarchive.library.unt.edu/web/20130215204412im_/http://www.cdc.gov/h1n1flu/yearinreview/images/slide_42a_image.jpg)
Groups at Increased Risk of Severe Influenza (2009 H1N1)
- Most impacted populations
- Children, young adults
- Persons with underlying chronic medical conditions (e.g. chronic lung disease, heart disease, immunosuppression, neurological and neurodevelopment diseases)
- Mujeres embarazadas
- Indigenous populations
- Possible risk groups
- Obesity (Body Mass Index ≥35), Extreme/Morbid obesity (Body Mass Index ≥40)
2009 H1N1 Hospitalizations Frequency of Underlying Conditions in Adults EIP April 15, 2009 – February 16, 2010 (n=4,987)
![This slide shows the frequency of underlying conditions in adults who were hospitalized with 2009 H1N1, using EIP data from April 15, 2009 to February 16, 2010](https://webarchive.library.unt.edu/web/20130215204412im_/http://www.cdc.gov/h1n1flu/yearinreview/images/slide_44a_image.jpg)
Underlying conditions among hospitalized patients and those who died from H1N1 compared to the general population
![This slide shows the frequency of underlying conditions among hospitalized patients and those who died from H1N1 compared to the general population](https://webarchive.library.unt.edu/web/20130215204412im_/http://www.cdc.gov/h1n1flu/yearinreview/images/slide_45a_image.jpg)
*Excludes hypertension
** Morbid obesity is defined as BMI of 40 or higher. For Hospitalized H1N1 patients, BMI calculation was performed on non-pregnant adults ≥ 20 years (n=119). 45% of 119 non-pregnant hospitalized adults ≥ 20 years were missing height and weight information. For Novel H1N1 Deaths, morbid obesity % was calculated for adults only. Prevalence for US non-pregnant adults is based on NHANES (JAMA. 2006;295(13):1577)
Source O Morgan, et al.
Obesity: a New Risk Factor for Severe Illness due to 2009 H1N1
- Disproportionate number of obese, particularly morbidly obese, among severely ill during 2009 H1N1 pandemic
- Morbid obesity (BMI≥40) was associated with hospitalization, and possibly death, due to 2009 H1N1 infection among adults without chronic medical conditions
- Additional studies with larger sample of patients and appropriate comparison groups are needed
Morgan OW, Bramley A, et al. (2010)
PLoS ONE 5(3): e9694. doi:10.1371/journal.pone.0009694
Age-adjusted and Season-specific 2009 H1N1 Influenza-related Hospitalization Rates (per 100,000) by race & ethnicity – Emerging Infections Program, 2009-10
Raza/Etnia |
Temporada de influenza |
|
2009 |
2009-10 |
|
Blancos, no hispanos |
3.0 |
16.3 |
De color, no hispanos |
10.9 |
29.7 |
Hispanos |
8.2 |
30.7 |
Asiático/de Islas del Pacífico |
8.1 |
12.5 |
Indígenas de EE.UU./Nativos de Alaska |
4.1 |
32.7 |
2009: April 15 - August 31, 2009 2009-10: September 1, 2009 - January 26, 2010 |
2009 H1N1 Cumulative Lab-Confirmed Death Rate, by Age Group – April 2009 through March 27, 2010
![This slide shows the 2009 H1N1 Cumulative Lab-Confirmed Death Rate, by Age Group from April 2009 through March 27, 2010](https://webarchive.library.unt.edu/web/20130215204412im_/http://www.cdc.gov/h1n1flu/yearinreview/images/slide_48a_image.jpg)
Next: 2009 H1N1 Accomplishments >
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