CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Pinworm infection of the appendix. Light micrograph of a section through an appendix infected by pinworms (Enterobius vermicularis). Pinworms, or threadworms, are nematode worms that parasitise the intestinal system of many animals. In humans they cause the common infection enterobiasis. Nematodes are unsegmented worms that may be parasitic or free-living depending upon the species.
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