1. Lecture: TAPEWORMS- Diphyllobotriosis

Question 1

Who are the final hosts and who are the intermediate hosts of the parasite DIBOTHRIOCEPHALUS LATUS (latin-genus of Diphyllobothriosis) ?

Answer 1

IH: 1. copepod-in body cavity, 2. fish, amphibians and reptiles

Question 2

How does final host get infection (of DIBOTHRIOCEPHALUS LATUS) ?

Answer 2

raw, undercooked fish (sushi) and caviar (pike, trout, perch, minnow)

Question 3

what does plerocercoid look like in a fish and where is it located?

Answer 3

-6-20 mm long, creamy color, wrinkled.
-Located in: muscles, abdominal wall, liver, ovaries

Question 4

describe adult worm: of plerocercoid?

Answer 4

-up to 20m
-elongated scolex
-scolex with 2 grooves
-SUCKERS (no hooks)
-mature proglottids WIDER than long
-uterine pore present
-uterine and genital pore medialle
-uterus rosette-like-coiled and central

Question 5

how to tell difference between cyclophyllidean chain of proglottids and pseudophyllidean strobila?

Answer 5

-cyclophyllidean proglottis: 2 sets of genital organs on the sides (moniezia expanse, moniezia benedeni) 2 sets female 2 sets male>no uterine opening > uterus filling whole segments
-pseudophyllidean stropila: proglottis arranged in strobila (=chain)
==body consists of proglottids/segments this together forms strobila (chain)> rosette-like-coiled uterus medially

Question 6

egg morphology?

Answer 6

eggs with operculum and small knob

Question 7

what are main symptoms of diphyllobothriasis in humans and animals?

Answer 7

mostly asymptomatic-but long-lasting infection.>animals : fatigue,abdomianl pain, bomiting, diarrhea-weight loss, anemia > humans: long lasting, vitamin b12-deficiency, anemia, abdominal cramps, cholecystitis, intestinal obstruction

Question 8

what method can be used to identify eggs of this worm?

Answer 8

-faecal flotation method
-sedimentation method

Question 9

how to prevent infection?

Answer 9

-fish frozen or cooked
-infected human or animal faeces may not get into freshwater seas
-sushi no