Bird flu, malaria, plague and West Nile virus are infectious diseases we've all heard of. Find information on these epidemics and more in this section.

Does SARS have an effect on white blood cells?

SARS causes a low white blood cell count. Learn more about how SARS affects white blood cells from this article.

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  • How Ebola Works

    How Ebola Works

    If you've seen the movie "Outbreak," you may think you know Ebola. You don't. For one, you don't necessarily die from this hemorrhagic fever. For another, people infected with it don't always wind up bleeding out of their various orifices. See more »

  • How Leper Colonies Work

    How Leper Colonies Work

    Leprosy was the AIDS of the first millennium – a disfiguring disease that struck terror since people thought it was easy to contract. Patients were banished to live in leper colonies. What was life like there? See more »

  • How long can a germ live in a room?

    How long can a germ live in a room?

    How long can a germ live in a room? My son had a friend over, and the friend was coughing all over the house. How long can his germs infect people? See more »

  • If you have HIV, does it mean you have AIDS, too?

    If you have HIV, does it mean you have AIDS, too?

    Early rumors claimed that having HIV doesn't mean that you necessarily have AIDS. Is there any truth to this? See more »

  • Malaria Overview

    Malaria Overview

    If you're a mother in tropical Africa, a biting mosquito is one of your worst fears, because it can transmit malaria. Learn about this serious, often fatal disease and find out why it's one of the world's most pressing public health concerns. See more »

  • MRSA 101

    MRSA 101

    MRSA, also called the superbug, is a bacterium becoming resistant to antibiotics. Read about treating MRSA infections and how MRSA can be controlled. See more »

  • Mysterious Bacteria Quiz

    Mysterious Bacteria Quiz

    E. coli is a common type of bacteria that can lead to serious health issues. Take this quiz to test your bacteria knowledge and learn about healthy forms of bacteria. See more »

  • West Nile Virus Overview

    West Nile Virus Overview

    Ever since West Nile Virus arrived in the United States, it's been treated as a serious, growing threat. This virus, transmitted by mosquitoes, is potentially deadly -- but what are your chances of contracting it? See more »

  • 5 Things You Don’t Know About HIV

    5 Things You Don’t Know About HIV

    Learn about HIV – a life-altering disease that so many people know so little about. See more »



    What are the definitions of HIV and AIDS terms? Learn about the symptoms and spreading of HIV and AIDS. See more »

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