Цевчести црви

Magnified 128X, this photomicrograph revealed some of the ultrastructural features displayed by a Trichuris trichiura egg. The nematode, or roundworm, is also called the human whipworm. T. trichiura eggs are 50µm-55µm by 20µm-25µm. As is exemplified by this specimen, eggs are football-shaped, thick-shelled, and possess a pair of polar plugs at each end. Eggs are passed unembryonated in stool.Created: 1979

This diagram depicts the various stages in the life cycle of the human pinworm nematode Enterobius vermicularis.Created: 1982

This is an illustration of the life cycle of Dracunculus medinensis, the causal agent of Dracunculiasis.Created: 2002

This diagram depicts the various stages in the life cycle of the nematode Trichinella spiralis.Created: 1982

This photomicrograph reveals histopathologic changes indicative of the presence of the intestinal parasitic nematode (roundworm), Strongyloides stercoralis.Clinical Features:Frequently asymptomatic. Gastrointestinal symptoms include abdominal pain and diarrhea. Pulmonary symptoms (including Loeffler’s syndrome) can occur during pulmonary migration of the filariform larvae. Dermatologic manifestations include urticarial rashes in the buttocks and waist areas. Disseminated strongyloidiasis occurs in immunosuppressed patients, can present with abdominal pain, distension, shock, pulmonary and neurologic complications and septicemia, and is potentially fatal. Blood eosinophilia is generally present during the acute and chronic stages, but may be absent with dissemination.Created: 1972

This photomicrograph reveals histopathologic changes indicative of the presence of the intestinal parasitic nematode (roundworm), Strongyloides stercoralis.Clinical Features:Frequently asymptomatic. Gastrointestinal symptoms include abdominal pain and diarrhea. Pulmonary symptoms (including Loeffler’s syndrome) can occur during pulmonary migration of the filariform larvae. Dermatologic manifestations include urticarial rashes in the buttocks and waist areas. Disseminated strongyloidiasis occurs in immunosuppressed patients, can present with abdominal pain, distension, shock, pulmonary and neurologic complications and septicemia, and is potentially fatal. Blood eosinophilia is generally present during the acute and chronic stages, but may be absent with dissemination.Created: 1972

Magnified 240X, this photomicrograph revealed the presence of a Heterodera sp. nematode egg.Created: 1974

Magnified 240X, this photomicrograph revealed the presence of a Heterodera sp. nematode egg.Created: 1974

Magnified 500X, this photomicrograph of an unstained, formalin-preserved stool specimen mount, revealed the presence of a Trichuris vulpis nematode egg. T. vulpis is a whipworm that is common to dogs.Adult worms are 30 – 50nm in length, and as parasites, reside in the ceceum, a region of the large intestine where it is joined by the small intestine or ileum. This specie of whipworm, though common to canines, has been found in the human digestive tract.Created: 1973

This illustration depicts the life cycle of A. simplex and P. decipiens, the causal agents of Anisakiasis.Created: 2002

This is an illustration of the life cycle of Toxocara canis and Toxocara cati, the causal agents of Toxocariasis.Created: 2002

This illustration depicts the life cycle of Brugia malayi, the causal agent of Filariasis.Created: 2002

Magnified 128X, this photomicrograph depicted an egg from the parasitic nematode, Trichostrongylus.Created: 1979

Ancylostoma braziliense mouth parts. Hookworm, parasite.From Wikimedia

Trichinella larvae in pressed bear meat, partially digested with pepsin.From DPDx

This slide contained two specimens. USNM 51274 and USNM 51275.

This slide contained two specimens. USNM 51274 and USNM 51275.

This slide contained two specimens. USNM 51274 and USNM 51275.