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An infecting organism, or pathogen, interferes with your normal functioning. Your body's response to infection is inflammation.

Parasites reduce your fitness in many ways. Parasitic diseases account for a large proportion of human sicknesses.

Candida albicans is a yeast (fungus), which causes oral and genital infections in humans.

Helicobacter pylori are bacteria inhabiting areas of the stomach. It causes a chronic inflammation and is strongly linked to ulcers and stomach cancer. Over 80% of individuals infected with H. Pylori have no symptoms.

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