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Human parasites are divided into endoparasites, which cause infection inside the body, and ectoparasites, which cause infection superficially within the skin. The cysts and eggs of endoparasites may be found in feces , which aids in the detection of the parasite in the human host while also providing the means for the parasitic species to exit ...
Image showing life cycle inside and outside of the human body of one fairly well described helminth: A. lumbricoides. Ascaris lumbricoides, a roundworm, infects humans via the fecal-oral route. Eggs released by adult females are shed in feces. Unfertilized eggs are often observed in fecal samples but never become infective.
The life cycle begins with eggs being ingested. [12] The eggs hatch in the duodenum (first part of the small intestine ). [ 19 ] The emerging pinworm larvae grow rapidly to a size of 140 to 150 micrometres, [ 9 ] and migrate through the small intestine towards the colon . [ 12 ]
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The parasite is only known to reproduce sexually in the cat family. [9] However, it can infect most types of warm-blooded animals , including humans. [ 9 ] Diagnosis is typically by testing blood for antibodies or by testing the amniotic fluid in a pregnant patient for the parasite's DNA .
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The S. erinaceieuropaei life cycle is complex and consists of three hosts. The life cycle starts when eggs are discharged via feces from the definitive host. When discharged, the eggs are immature until they reach a fresh water source. Once in fresh water, the eggs hatch to become first stage larvae (coracidia).
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