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3. Parasites

A microscopic parasite, Giardia, feeds off of other organisms to survive. It causes an infection in the intestines called giardiasis and passes from the body in the feces. Foul-smelling, bright yellow diarrhea is a symptom of the condition. Individuals can be infected if they come into contact with infected surfaces, people, or bodies of water where Giardia bacteria live. Eating uncooked food that contains the organisms can also lead to infection.

infection intestines feces giardia parasite Dr_Microbe / Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.