LONDON, ENGLAND - JULY 30: A woman wearing a surgical mask to prevent the transmission of airborne infection walks in Westminster on July 30, 2009 in London, England. Figures released by the Health Protection Agency show that by July 19, an estimated 100,000 Britons have been infected with swine flu and there have been 26 deaths in England linked to the disease. Over 700 people worldwide have died after contracting swine flu which is spreading faster than any other flu pandemic. (Photo by Oli Scarff/Getty Images)
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4 ways the flu turns deadly
Although the fever and aches feel terrible, most people don't die from the flu. CNN's Elizabeth Cohen explains how this common illness can turn lethal.
01:39 - Source: CNN
The flu 14 videos
LONDON, ENGLAND - JULY 30: A woman wearing a surgical mask to prevent the transmission of airborne infection walks in Westminster on July 30, 2009 in London, England. Figures released by the Health Protection Agency show that by July 19, an estimated 100,000 Britons have been infected with swine flu and there have been 26 deaths in England linked to the disease. Over 700 people worldwide have died after contracting swine flu which is spreading faster than any other flu pandemic. (Photo by Oli Scarff/Getty Images)
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4 ways the flu turns deadly
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SAN FRANCISCO, CA - JANUARY 22: Simone Groper receives a flu shot at a Walgreens phramacy on January 22, 2018 in San Francisco, California. A strong strain of H3N2 influenza has claimed the lives of 74 Californians under the age of 65 since the flu season began in October of last year. People are being encouraged to get flu shots even through the vaccine has been only 30% effective in combating the influenza. (Photo by Justin Sullivan/Getty Images)
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LOS ANGELES, CA - OCTOBER 26: Emily Moore administers an inoculation as free flu shots are given to people over 50 by the Los Angeles County Department of Health Services on October 26, 2005 in Los Angeles, California. An estimated 60 million flu shots will be given in the United States this season. (Photo by David McNew/Getty Images)
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