According to the Centers for Disease Control and Prevention, pregnancy puts Wolf at higher risk of complications for flu in general, and so far that also holds true for the novel 2009 H1N1 virus.

CNN: Surviving H1N1 -- with baby in belly

Last year, however, Simonsen and Viggo Andreasen concluded that the true R-naught of the 1918 flu virus was probably somewhere between 3 and 4.

CNN: Scientists dig for lessons from past pandemics

This is true of the flu, hepatitis and AIDS. With the avian flu, we've modeled the virus on supercomputers, and we think we understand why it binds deep in the lungs--it's not communicable--you don't cough it up.

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But with games like Natas, named for a virus that spread via floppy disk in 1992, Van Acker says he hopes to fill a niche for true beginners learning the basics of web attacks and web security.

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