Trichinella roundworms are passed among animals. The most common way humans get trichinosis, the disease caused by this roundworm, is by eating undercooked meat that contains larvae. The larvae mature in the intestines. As they reproduce, those larvae can travel outside the intestines into muscle and other tissue.
Can intestinal parasites live outside the body?
Giardiasis is a diarrheal disease caused by the microscopic parasite Giardia duodenalis (or “Giardia” for short). Once a person or animal has been infected with Giardia, the parasite lives in the intestines and is passed in stool (poop). Once outside the body, Giardia can sometimes survive for weeks or even months.
Can parasites live outside of a host?
Parasites that live outside the host are called ectoparasites (Figure 2A). For example, a flea is a parasite that lives on cats. In contrast, parasites that live inside their hosts are known as endoparasites (Figure 2B).
Do parasites live in stomach or intestines?
Parasites can live in the intestines for years without causing symptoms. When they do, symptoms include the following: Abdominal pain. Diarrhea.
Can parasites be internal and external?
Internal parasites, such as roundworms and coccidia, live inside the gastro-intestinal tract whereas external parasites, such as lice and flies live on, or around, the animal. It is important that all parasites are not considered as a single group when planning control measures.
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