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Fight the Flu: Influenza Season 2009-2010

Novel H1N1 Flu
("swine flu" or "pandemic flu") more about H1N1 »
Seasonal Flu

What To Do If You Get Sick:
2009 H1N1 and Seasonal Flu »

How Does Seasonal Flu Differ From Pandemic Flu?

from flu.gov

Pandemic Flu

Seasonal Flu

Occurs rarely (three times in 20th century - last in 1968) Outbreaks follow predictable seasonal patterns; occurs annually, usually in winter, in temperate climates
No previous exposure; little or no pre-existing immunity Usually some immunity built up from previous exposure

Healthy people may be at increased risk for serious complications
Healthy adults usually not at risk for serious complications; the very young, the elderly and those with certain underlying health conditions at increased risk for serious complications
Health systems may be overwhelmed Health systems can usually meet public and patient needs
Vaccine probably would not be available in the early stages of a pandemic Vaccine developed based on known flu strains and available for annual flu season
Effective antivirals may be in limited supply Adequate supplies of antivirals are usually available
Number of deaths could be quite high (e.g., U.S. 1918 death toll approximately 675,000) Average U.S. deaths approximately 36,000/yr
Symptoms may be more severe and complications more frequent
Symptoms: fever, cough, runny nose, muscle pain. Deaths often caused by complications, such as pneumonia.
May cause major impact on society (e.g. widespread restrictions on travel, closings of schools and businesses, cancellation of large public gatherings)  Generally causes modest impact on society (e.g., some school closing, encouragement of people who are sick to stay home)
Potential for severe impact on domestic and world economy Manageable impact on domestic and world economy

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