Microorganisms and Disease

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The effects that an infection has on the body, such as a fever (raised body temperature) or a rash are called the symptoms. Different microorganisms cause different symptoms, but they all damage the body in one way or another. The damage is done to the body's cells.

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Some microorganisms damage cells directly. For example, malaria parasites invade red blood cells and multiply inside them, eventually making the cells burst open. Malaria causes flu-like symptoms.

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