Hymenolepsis spp

Question 1

geography of Hymenolepsis

Answer 1

worldwide

Question 2

order of Hymenolepsis spp

Answer 2

Cyclophyllida

Question 3

Hymenolepsis spp

Answer 3

• Hymenolepis nana 4 cm
• Hymenolepis diminuta 20 – 60 cm.
• Hymenolepis microstoma 30 – 80 cm

Question 4

IH of Hymenolepsis

Answer 4

Beetles

Question 5

FH of Hymenolepsis

Answer 5

Man, rodents – most common tapeworm of humans

Question 6

Location of Hymenolepsis

Answer 6

SI

Question 7

Egg morphology of Hymenolepsis

Answer 7

Small, subspherical, 3 thick shells, embryonated, transparent, light brown

Question 8

LC of Hymenolepsis

Answer 8

1. Adults in the intestines releases eggs out in the feces.
   a. The beetle larvae ingest the eggs. The oncosphere hatches from the eggs, penetrates the hemocoel and forms into cysticercoid. The FH eats beetle.
   b. Eggs are eaten by the FH. The egg hatches, and the oncosphere burrows into the lymphatic vessels of the villus. Forms cysticercoid. It then later matures, leaves the villus and enters the intestine.

Question 9

Pathogenesis of Hymenolepsis

Answer 9

Generally non since worm is so small.

Question 10

Transmission of Hymenolepsis

Answer 10

1. Ingestion of infected beetle
2. Ingestion of food contaminated with feces (human or rodent)
3. Fecal-oral contact

Question 11

CS of Hymenolepsis

Answer 11

Mild infection gives no symptoms.
Severe: inflammation of mucosa, anorexia, vomitus, abdominal pain, diarrhea

Question 12

DX of Hymenolepsis

Answer 12

Egg in feces, egg have polar filaments.
H. diminuta does not have polar filaments

Question 13

Tx of Hymenolepsis

Answer 13

Praziquantel, Niclozamide

Question 14

Control of Hymenolepsis

Answer 14

Removal of rats from houses

Question 15

Lenght of Hymenolepis nana

Answer 15

4 cm

Question 16

Lenght of Hymenolepis diminuta

Answer 16

20 – 60 cm.
No rostrellum or hooks

Question 17

Lenght of Hymenolepis microstoma

Answer 17

30 – 80 cm