15. Taenia hydatigena - cysticercus tenuicollis

Question 1

IH of Taenia hydatigena

Answer 1

Ru, pig

Question 2

FH of Taenia hydatigena

Answer 2

Canids

Question 3

Location of Taenia hydatigena

Answer 3

IH: hanging from different organs
FH: SI

Question 4

Morphology of Taenia hydatigena

Answer 4

Up to 6 m, scolex with 4 suckers, rostellum with 2 rows of 33-44 hooks, neck and 800-1000 proglottids

Question 5

Pathogenesis of Taenia hydatigena

Answer 5

• FH: Produce only mild inflammation in the site of attachment. Typically, asymptomatic.
• IH: traumatization of intestinal mucosa, liver parenchyma. Hepatitis traumatica cysticercosa acuta = fatal. Gives liver cirrhosis and inflammation in lungs. Migration marks can be present in the liver due to the migration – leads to fatal and acute hepatitis in young animals. Peracute form: mortality without symptoms.

Question 6

CS of of Taenia hydatigena

Answer 6

• IH: usually asymptomatic
• FH: usually asymptomatic

Question 7

Dx of Taenia hydatigena

Answer 7

• IH: necropsy
• FH: feces

Question 8

Tx of Taenia hydatigena

Answer 8

IH: none
FH: praziquantel

Question 9

Control of Taenia hydatigena

Answer 9

Restrict canine access to sheep pasture

Question 10

LC of Taenia hydatigena

Answer 10

1. Adult taenia is attached to SI of FH. Mature, egg-containing proglottids are released and shed through the feces.
2. The eggs get released from the proglottid, & is ingested by IH. The hexacanth larva hatches and migrates through the liver tissue to encyst in peritoneal membranes where it develops into a cysticercus tenuicollis (large infectious larvocyst, 7-8 cm).
3. FH ingest the cysticercus, and it develop into an adult in the small intestine.

Question 11

Metacestode of of Taenia hydatigena is called

Answer 11

Cysticercus tenuicollis