Taenia ovis - cysticercus ovis

Question 1

What is the intermediate host (IH) for Taenia ovis?

Answer 1

Sheep, goat

Question 2

FH of Taenia ovis?

Answer 2

canids

Question 3

Location Taenia ovis?

Answer 3

IH: Striated muscles; Cardiac, diaphragm, masseter, tongue, thigh & shoulder muscles

FH: SI

Question 4

Morphology Taenia ovis?

Answer 4

Up to 2 m. Scolex with 4 suckers, rostellum with 2 rows of 22-32 rostellar hooks, neck, 500-1000 proglottids

Question 5

Pathogenesis of Taenia ovis?

Answer 5

Usually non-clinical. Larva migration may cause mild tissue damage. Cysts in muscle

Question 6

CS of Taenia ovis?

Answer 6

IH: Asymptomatic, detec cysts at slaughter
FH: usually asymptomatic, mild gastrointestinal signs, gravid proglottids in feces.

Question 7

Dx of Taenia ovis?

Answer 7

IH: meat inspection - cysts in heart, diaphragm, skeletal muscles
FH: flotation (Breza), observation of proglottids in feces/around anus

Question 8

Tx of Taenia ovis?

Answer 8

IH: none
FH: Praziquantel

Question 9

Control of Taenia ovis?

Answer 9

IH: proper disposal of sheep carcass & offal, educate farm workers & shepherds, meat inspection - detect cyst at slaughter
FH: Regular deworming, keep dogs away from sluaghter areas, avoid contamination of pastures with dog feces.

Question 10

LC of Taenia ovis?

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 to skeletal & cardiac muscles. Develop into cysticercus ovis.
3. FH ingest the cysticercus, attach to mucosa of SI & mature. Release gravid proglottids.

Question 11

Metacestode of Taenia ovis is called

Answer 11

Cysticercus ovis

Question 12

What is the common name for the infection caused by Taenia ovis?

Answer 12

Sheep measles