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This gradually evolving virus spreads easily from person to person, and can be deadly for high risk groups such as the very young and old.

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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.

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CNN Chief Medical Correspondent Dr. Sanjay Gupta explains the causes and symptoms of chronic traumatic encephalopathy, more commonly known as CTE.

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EDITOR’S NOTE: The following interview was done in 2018, while the subject, Marissa Presnell, was preparing for surgery. A follow-up interview appears elsewhere in this publication.

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Janine Russell spotted a phone number at the end of a "Good Morning America" segment for the United Network for Organ Sharing, wrote it down, and called it -- starting a chain reaction that en…

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