Kenyan health officials take the temperatures of passengers arriving at the Nairobi airport on Thursday. Kenya has no reported cases of Ebola, but it's a transportation hub and so is on alert. Simon Maina/AFP/Getty Images hide caption

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Simon Maina/AFP/Getty Images

A Virtual Outbreak Offers Hints Of Ebola's Future

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Developing a vaccine for meningitis B was tricky. Even the existing vaccine doesn't protect against all B strains. Josef Muellek/ hide caption

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Josef Muellek/