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
01 flu virus
Now playing
4 ways the flu turns deadly
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)
Now playing
Four ways the flu turns deadly
flu flesh eating
Now playing
Flu diagnosis ends up being flesh-eating disease
Kyler Baughman
Now playing
21-year-old dies from flu complications
cdc flu virus
Now playing
Seasonal flu: What you need to know
deadly flu virus could doctors do more_00002629.jpg
Now playing
Deadly flu virus: Could doctors do more?
8 year old dies from flu despite flu shot sot_00000505.jpg
Now playing
8-year-old dies of flu despite flu shot
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)
Now playing
CDC: Flu virus will be around many more weeks
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)
Now playing
How the flu spreads
lead elizabeth cohen flu live jake tapper_00003823.jpg
Now playing
CDC: Deadly flu season will likely get worse
predict flu 2
Now playing
Know when and where the flu will hit
predict flu 1
Now playing
Don't believe this about the flu
Flu shot
Now playing
CDC reports 10 more pediatric flu deaths
Government shutdown could halt CDC flu program nr_00000000.jpg
Now playing
Government shutdown could halt CDC flu program