Exam II - Anoplocephala spp

Question 1

What taxonomic order do Anoplocephala spp belong to?

Answer 1

Cyclophyllidea

Question 2

Which is more common: Anoplocephala perfoliata or Anoplocephala magna?

Answer 2

Anoplocephala perfoliata

Question 3

Describe the appearance of the Anoplocephala perfoliata adult

Answer 3

large, white, up to 4 cm, with a rounded scolex with a lappet behind each of the 4 suckers.

(A. magna doesn’t have lappets)

Question 4

Describe the appearance of the Anoplocephala spp. egg

Answer 4

~50-80 um, contain small embryo, have an irregular shape

Question 5

What is the infective stage for Anoplocephala spp?

Answer 5

Cysticercoid

Question 6

Describe the Anoplocephala spp life cycle

Answer 6

Mature segments pass in feces, disintegrate, and release eggs.

Eggs ingested by mites and develop to cysticercoids

Infected mite eaten by horse while grazing

PPP is 1-2 months

Question 7

How is a horse infected with Anoplocephala spp?

Answer 7

The horse eats a mite infected with cysticercoid while grazing

Question 8

What is/are the site(s) of infection for Anoplocephala perfoliata and Anoplocephala magna?

Answer 8

• Anoplocephala perfoliata*: large intestine
• Anoplocephala magna*: small intestine

Question 9

Describe any pathogenesis associated with Anoplocephala spp infections

Answer 9

• Heavy infections cause ulcerations
• partial occlusion of ileocecal valve
• intussusception of the terminal ileum & cecum

Question 10

Which diagnostic methods would be most appropriate for diagnosing Anoplocephala spp?

Answer 10

Centrifugation/flotation, sedimentation, and ELISA

Question 11

What is the treatment of choice for Anoplocephala spp?

Answer 11

Praziquantel