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Microorganisms are living things that are so small that they can not be seen by the naked eye. When a microorganism causes a disease it is then called a pathogen. A host is a scientific term used to refer to whatever the pathogen is living in. So a host could be an animal, such as a human, or even a plant. An infection occurs once a pathogen enters a host. Disease occurs after infection once the pathogen disrupts homeostasis, or "the balance", in the host's normal functions. The study of this process is known as pathology, and the process of a disease being caused by a pathogen in a host is called pathogenesis.

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14y ago
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13y ago

your white blood cells help fight bad invading germs

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11y ago

coughing, running nose,

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Q: How germs affect the body?
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