What is the most common intestinal parasite in the U.S.?

Giardiasis is a parasitic infection of the gastrointestinal tract that results from a protozoan organism called Giardia lamblia. Giardiasis, like most parasitic gastrointestinal infections, is transmitted primarily through contaminated water by an oral-fecal route - meaning the organism is ingested orally, the parasitic infection occurs, and infective forms of the parasite are passed in the feces to continue the cycle in other hosts. Giardiasis can also be transmitted by direct contact, one person to another. Giardiasis is probably the most common parasitic intestinal infection in the world, as well as in the United States.

Continue Learning about Parasitic Infections

Parasitic Infections

Parasitic Infections

Parasitic infections begin when a person comes into contact with a disease-causing parasite like tapeworms, roundworms. You can contract these types of infections through contact with contaminated food, soil or water, often in tro...

pical regions. Symptoms of parasitic infections can include digestive problems, irritability, chronic fatigue, acne, rashes, sleep problems, anemia, muscle cramps, allergies and headaches. While there is no vaccine, treatment for parasites can include medications or topical applications.

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.