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Left: Adult male of E. vermicularis from a formalin-ethyl acetate (FEA) concentrated stool smear. The worm measured 1.4 mm in length. Image courtesy of Centre for Tropical Medicine and Imported Infectious Diseases. Right: Image of the eggs of the human parasite Enterobius vermicularis, or 'human pinworm', captured on cellulose tape under significant magnification.

Strongyloidiasis was first described in French troops stationed in modern day Vietnam during the late 19th century who were suffering from severe, persistent diarrhea. It is a parasitic disease caused by nematodes, or roundworms, in the genus Strongyloides that enter the body through exposed skin, such as bare feet. Strongyloides is most common in tropical or subtropical climates.

Most people who are infected with Strongyloides do not know they are infected and have no symptoms. Others may develop a severe form and, if untreated, become critically ill and potentially die.

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