Nematodes of Horses Flashcards

1
Q

Trichostrongylus axei (site)

A

stomach

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2
Q

Trichostrongylus axei (Pathogenesis)

A

Cushion-like thickening of glandular part of stomach

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3
Q

Trichostrongylus axei (route of infection)

A

Ingestion of L3 – non-migratory in host

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4
Q

Habronema and Draschia (site)

A

Stomach

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5
Q

Habronema and Draschia (Route of infection)

A

Adults – stomach, Larvae – skin wounds (“summer sores”), conjunctivae

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6
Q

Habronema and Draschia (eggs)

A

1 species lays larvated egg – thin shelled & very elongated;
other species lay larvae.
Eggs usually don’t float.

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7
Q

Habronema and Draschia (Pathology)

A

Draschia – lg. stomach nodules

Habronema - gastritis

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8
Q

Parascaris equorum (site)

A

Small intestine of young horses (under 6 months)

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9
Q

Parascaris equorum (egg)

A

spherical, pitted thick shell, brown

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10
Q

Parascaris Equorum (Importance)

A

Verminous pneumonia; rarely intestinal obstruction/rupture

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11
Q

Strongyloides westeri (host)

A

Horse; donkey (foals)

Females parasitic; may be free-living

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12
Q

Large Strongyles (common name)

A

red worm

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13
Q

Large Strongyles (site)

A

cecum/colon

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14
Q

Large Strongyles (type of feeding)

A

draw a mass of intestinal mucosa into buccal capsule and digest it – leaves scars with raised heavy fibrous rim – easily seen on the gut wall.

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15
Q

Most important nematode of the horse

A

Strongylus vulgaris

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16
Q

Importance of strongylus vulgaris

A

most common
gut lesions -erosion and blood letting
Serious action on large arterial trunks, esp. cranial mesenteric a. May be fatal.
Occasional cerebrospinal nematodiasis

17
Q

importance of small strongyles

A

With heavy infection, catarrhal enteritis ( is an inflammation of the mucous membrane of the. small intestine), progressive fibrosis (characterized by the development of large conglomerate masses of dense fibrosis (usually in the upper lung zones),), thickening of gut wall

18
Q

Cyathostominae

A

Small red worms

small strongyles

19
Q

What eggs have the same appearance?

A

Trichostrongylus, small and large strongyles

20
Q

Control of strongyles

A

Deworm adults every 2-3 months
Mixed grazing – have ruminants graze horse pasture
Small paddocks – clean feces away once/week

21
Q

Oxyuris equi (common name)

A

Pinworm of horses

22
Q

Oxyuris Equi (site)

A

small intestine; migrate to large intestine – anus to lay eggs

23
Q

Oxyuris Equi (eggs)

A

Operculated; flattened on one side

24
Q

Dictyocaulus arnfeldi (common name)

A

lungworm of horse

25
Q

Dictyocaulus arnfeldi (site)

A

large bronchioles, bronchi, trachea

26
Q

Dictyocaulus arnfeldi (host)

A

Equidae – donkeys esp.; ruminants; camels

27
Q

Setaria equina (site)

A

In peritoneal cavity,either free or on serosal surface

28
Q

Setaria equina (importance)

A

harmless; but if it migrates it can cause blindness

29
Q

Thelazia lacrimalis (host)

A

most mammals

30
Q

Thelazia lacrimalis (location)

A

orbital region

31
Q

Thelazia lacrimalis (importance)

A

rarely a problem