Uncommon species of intestinal flukes — photos

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Adult Heterophyes heterophyes.

Photo 1. Adult heterophyes. This is an uncommon but widely distributed trematode with a typical life cycle in brackish water snails such as Pirenella (see Table XI). The cercariae encyst on fish such as the mullet and infect man when improperly cooked fish is eaten. The adult trematode shown here is very small and lives in the middle part of the small intestine. The eggs (see 307) are very similar to those of Clonorchis and Metagonimus. (x 35)

Adult Metagonimus yokagawai.

Photo 2. Adult Metagonimus yokagawai. This is the most common heterophyid fluke of the Far East but is also found in the Mediterranean basin. The life cycle is similar to that of Heterophyes and the eggs of the two species can only be separated with difficulty. The adult worm shown here is also very small (1.4 x 0.6 mm) and lives in the upper and middle jejunum. Several genera of snails including Semisulcospira (see Table XI) are the first intermediate hosts for the species; the cercariae encyst on fish. (x35)

Cyprinoid fish in an Eastern market.

Photo 3. Cyprinoid fish in an Eastern market. The mullet and other fish living in fresh or brackish waters are common intermediate hosts for H. heterophyes and M. yokagawai. The metacercariae are attached under the scales or in the skin.

Also see table

» Fingertip ulcers
» Herpetiform lesions
» Zocteriform lesions
» Uncommon species of intestinal flukes
» Infections Acquired through the Gastro-intestinal Tract
» Infections Acquired through the Skin and Mucous Membranes
» Airborne Infections
» Nutritional Disorders
» Miscellaneous Disorders
» Arthropod-borne Infection
» Soil-mediated Helminthiases
» Snail-mediated Helminthiases

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