Cyathostome

Question 1

Latin name

Answer 1

Cyathostome spp.

Question 2

Location in body

Answer 2

Caecum and colon

Question 3

Class

Answer 3

Nematode

Question 4

Life cycle length

Answer 4

5-6 weeks

can stay encapsulated for months/years - absorb nutrients

Question 5

Management

Answer 5

Poo picking

FEC - oval, thing-shelled strongyle eggs - L3 can not be detected during FEC

Question 6

Epidemiology

Answer 6

summer - optimal environmental conditions = rapid development of eggs to L3 can lead to accumulation of large infections in autumn

Many cyathostomes L3 ingested during autumn and stay in intestinal mucosa until spring

Question 7

Prepatent period

Answer 7

48-62 days

Question 8

Medicine

Answer 8

Moxidectin and Fenbendazole have efficacy against encysted cyathostomes

fenbendazole and pyrantel show some resistance

Question 9

What % of worm burden

Answer 9

90% of grazing horse worm burden

Question 10

Pathogenesis

Answer 10

Summer - encysted for 10 days after which larvae emerge.
- re-enters gut and develops into adult worm

Nov-Feb - larvae inhibited/dormant

• large numbers encyst
• mass emergence at the end of dormant period

Question 11

Clinical signs

Answer 11

Diarrhoea, colic, ulcers, bleeding

2-3 year olds - unthriftiness, anaemia, sometimes diarrhoea

older horses - marked signs less common but general performance may be impaired

colitis = bowel inflammation (caused by mass emergence from gut wall

Question 12

Life cycle

Answer 12

• Eggs excreted onto pasture
• Hatch into larvae and move as far as 3 m
• Horse eats larvae
• When teach intestines the larvae burrows into gut lining to caecum and colon
• Stay encysted for 2 weeks- 3 years
• Develop into adults in large intestine