Diphyllobotriun Latum

Question 1

Life cycle

Answer 1

1) plerocercoid larva ingested with raw fish
2) larva are released from muscle in stomach and attaches to intestinal wall by scolex containing two grooves (bothria)
3) larvae mature and live in the small intestine where they achieve lengths up to 15m
4) terminal proglottids, gravid with hundreds of embryonated eggs, detach from colony, pass to colon and break up, releasing the embryonated eggs which pass in faeces
5) faeces is deposited in fresh water and coracidium hatches
6) intvertrbrate copepod eats free swimming larvae
7) minnow eats infected copepod
8) fish eats infected minnow, larvae migrates to fish muscle
9) adult takes about three months to grow to full length, may live in small intestines upto 4.5 years

Question 2

Pathologies

Answer 2

Vitamin b12 deficiency in Finland

Question 3

Clinical disease

Answer 3

Vitamin b12 deficiency leads to–> megaloblastoc anaemia ( immature erythrocytes)

Question 4

Diagnosis

Answer 4

Microscopic identification of eggs in the stool

Question 5

What, where and who?

Answer 5

• fish tapeworm
• endemic –> Russia, Brazil, Japan, and Scandinavia a little bit
• intermediate host - invertebrates and fresh water fish