Diphyllobothrium latum Flashcards
(15 cards)
order of Diphyllobothrium latum
Pseudophyllida
Geography of Diphyllobothrium latum
Large part of Europe, North America, Russia
IH of Diphyllobothrium latum
- Water crustaceans
- Fish
FH of Diphyllobothrium latum
Man, Ca, fel, fox, bear, fish eating mammals
Location of Diphyllobothrium latum
SI
Morphology of Diphyllobothrium latum
Scolex: 2 bothrium. Strobila: 4000 segments. Genital pore opens midventrally
- Human – up to 17 m
- Dogs – uo to 2.5 m
Egg of Diphyllobothrium latum
Medium size, ovoid with operculum, 2 thin shells, unembryonated, yellow/brown
LC of Diphyllobothrium latum
In Pseudophyllida, the egg reaches the water together with the host’s faeces, embryonates and eventually hatches and develops into a ciliated embryo – coracidium. These motile coracidia have to be taken up by 1IH (copepods) within a short time. Once inside the gut of the 1IH, the oncosphere sheds the ciliated layer and invades and differentiates into a procercoid. In the 2IH (fish), a plerocercoid forms. Inside the fish, the plerocercoid develops into the muscle. FH (human) eats the uncooked, infected fish. Adult tapeworm is developed in the small intestine.
Pathogenesis of Diphyllobothrium latum
Strong affinity for Vit B12 – important for forming erythrocytes in FH.
Leads to anemia
CS of Diphyllobothrium latum
Obstruction of SI – diarrhea or stop of feces. Enteritis, anaemia, anorexia, fatigue, dizziness, nausea, vomitis, hungery patient
Dx of Diphyllobothrium latum
Identifying proglottids or identify eggs in the faeces.
Tx of Diphyllobothrium latum
Praziquantel + Niclozamide
Control of Diphyllobothrium latum
Heat-treatment of fish meat
Epizootiology of Diphyllobothrium latum
Consumption of raw or undercooked fish.
Larva stage of Diphyllobothrium latum
1st IH: procercoid.
2nd IH: plerocercoid
