DIPHYLLOBOTHRIUM PACIFICUM PDF

Several other Diphyllobothrium species have been reported to infect humans, but less frequently; they include D. pacificum, D. cordatum. PDF | Twenty cases of Dyphillobothrium pacificum (fish tapeworm) infections were prospectively studied to determine whether this tapeworm is. Abstract. Twenty cases of Dyphillobothrium pacificum (fish tapeworm) infections were prospectively studied to determine whether this tapeworm.

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The cestode Diphyllobothrium latum the fish or broad tapewormthe largest human tapeworm. Several other Diphyllobothrium species have been reported to infect humans, but less frequently; they include D.

Immature eggs are passed in feces. Under appropriate conditions, the eggs mature approximately 18 to 20 days and yield oncospheres which develop into a coracidia. After ingestion by a suitable freshwater crustacean the copepod first intermediate diphgllobothrium the coracidia develop into procercoid larvae. Following ingestion of the copepod by a suitable second intermediate host, typically minnows and other dophyllobothrium freshwater fish, the procercoid larvae are released from the crustacean and migrate into the fish flesh where they develop into a plerocercoid larvae sparganum.

The plerocercoid larvae are the infective stage for humans. Because humans do paciifcum generally eat undercooked minnows and similar small freshwater fish, these do not represent an important source of infection.

Nevertheless, these small second intermediate hosts can be eaten by larger predator species, e. In this case, the sparganum can migrate to the musculature of the larger predator fish and humans pacificym acquire the disease by eating these later intermediate infected host fish raw or undercooked. After ingestion of the infected dipuyllobothrium, the plerocercoid develop into immature adults and then into mature adult tapeworms which will reside in the small intestine.

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The adults of D.

The adults can reach more than 10 m in length, with more than 3, proglottids. Immature eggs are discharged from the proglottids up to 1, eggs per day per worm and are passed in the feces.

Eggs appear in the feces 5 to 6 weeks after infection. In addition to humans, many other mammals can also serve as definitive hosts for D.

Freshwater fish infected with Diphyllobothrium sp. For example, cases of D. Diphyllobothriasis can be a long-lasting infection decades. Most infections are asymptomatic. Manifestations may include abdominal discomfort, diarrhea, vomiting, and weight loss. Vitamin B12 deficiency with pernicious anemia may occur. Massive infections may result in intestinal obstruction. Migration of proglottids can cause cholecystitis or cholangitis. Note the knob at the abopercular end.

Note the opercula are open. Section of an adult D.

Update on the Human Broad Tapeworm (Genus Diphyllobothrium), Including Clinical Relevance

The scolex was not present in this specimen. Close-up of a few of the proglottids from the specimen in Figure A, showing the rosette-shaped uterus at the center of each proglottid.

Sections of gravid proglottids containing eggs arrow of Diphyllobothrium sp. Image taken at x magnification. Eggs of Diphyllobothrium sp. Higher magnification x of eggs of Diphyllobothrium sp. Microscopic identification of eggs in the stool is the basis of specific diagnosis. Eggs are usually numerous and can be demonstrated without concentration techniques. Examination of proglottids passed in the stool is also of diagnostic value.

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Morphologic comparison with other intestinal parasites. Treatment information for diphyllobothriasis can be found at: DPDx is an education resource designed for health professionals and laboratory scientists. For an overview including prevention and paciificum visit www.

Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content. Enter Email Address What’s this? Recommend on Facebook Tweet Share Compartir. Life Cycle Immature eggs are passed in feces. Image Gallery Diphyllobothrium latum eggs in wet mounts. There is an operculum at one end that can be inconspicuous, and at the opposite abopercular end is a small knob that can be barely discernible.

The eggs are passed in the stool unembryonated.

Diphyllobothriasis

Egg of Diphyllobothrium sp. Carmine-stained proglottids of D.

Laboratory Diagnosis Laboratory Diagnosis Microscopic identification of eggs in the stool is the basis of specific diagnosis. Treatment Information Treatment Information Treatment information for diphyllobothriasis can be found at: Get Email Updates To receive email updates about this page, enter your email address: December 6, Page last updated: December 6, Content source: Linking to a non-federal site does not constitute an endorsement by HHS, CDC or any of its employees of the sponsors or the information and products presented on the site.