How a superflu is born: Antigenic shift
Influenza, also known as the flu, is a viral infection marked by fever, headaches, muscle aches and a cough. This year's flu season has hit the ground running, with many more cases reported much earlier in the season (which runs from November to March) th
The influenza outbreak of 1918 killed over 600,000 Americans "until it disappeared as mysteriously as it had begun.
"Microbes are the oldest form of life on Earth.
In this special feature, CNN not only reports on the latest flu season news, but also provides a lot of educational material.
"The enemy sneaks up on you so quietly that you don't even know it's there.
For high-school students and adults, the National Foundation for Infectious Diseases (NFID) presents a rigorous look at influenza.
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