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Humans have many organisms in and on their body that do not cause disease. These are called normal flora. We find them on our skin, in our noses and mouths, and in our intestines. They are harmless to humans because we are well-adapted to them; they benefit from us, and we benefit from them. If these bacteria or fungi end up in the wrong place, they can cause disease - for example, if our colon is perforated, bacteria may end up in the peritoneal cavity and cause severe infection there. Some organisms become problematic only when the immune system is impaired.

Some viruses also infect humans but don't cause disease unless the person becomes immunocompromised.

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17y ago

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