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Microbes help us and harm us

Microbes are extremely small organisms such as bacteria, protozoa and fungi. Even though we can't easily see them, they are all around us. Like it or not, microbes live on us and inside us. When people talk about "germs," they're generally talking about microbes.

Many diseases are caused by microbes. Plague, tuberculosis and pneumonia are caused by bacteria. Malaria is caused by a protozoan (a single-celled organism) that is spread among animals by mosquitoes. Also, many diseases, including swine flu, hepatitis and rabies, are caused by viruses, another type of microbe.
 
 

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