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INTERACTIVE
Understanding viruses
Learn how these tiny germs cause diseases
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Hand and germs illustration
How germs spread
Understanding how bacteria and viruses transmit is vital to preventing infection.

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Image: Pigs
Swine flu
Learn about the virus found in pigs and why it is causing concern among health officials.

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INTERACTIVE
Phases of a pandemic
The World Health Organization has categorized pandemics into six phases and two post-pandemic periods.
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