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3. Giardia

Giardia is another microscopic parasite that spreads through infected feces, but in this case, contaminated water is the most common source of human illness. This parasite can live outside of the body for weeks and has a shell that protects it against the corrosive effects of chlorine, so it can also survive in chlorinated bodies of water. To prevent a giardia infection, avoid drinking pond or pool water.

Giardia Shell Protected Illness Water 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.