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Parasitology > Equine Parasites > Flashcards

Equine Parasites Flashcards

1
Q

Hairworm

A

Tichostrongylus axei

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2
Q

Habitat of T. axei

A

Stomach

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3
Q

Host of T. axei

A

Equine, porcine, ruminant

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4
Q

Life cycle of T. axei

A

Direct
L3 ingested
Larvae travel to stomach and develop into adults

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5
Q

Patho of T. axei

A

Catarrhal gastritis

Hyperplastic gastritis (especially if ruminants close by)

Hypoproteinemia

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6
Q

Dx of T. axei

A

Eggs in poo

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7
Q

Stomach worm or Spiruid

A

Habronema spp and Draschia megastoma

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8
Q

Habitat of Habronema spp

A

Stomach and rarely cecum and colon

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9
Q

Life cycle of Habronema spp and D. megastoma

A

Indirect
Larvae from eggs in poo eaten by maggot–>fly
Fly deposits L3 into wound or fly ingested

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10
Q

Patho of Habronema spp and D.megastoma

A

Pulmonary Habronemiasis (pulmonary granulomas)

Cutaneous habronemiasis (Summer sore, granular dermatitis)= self mutilation leads to necrosis and calcification of 3rd stage L

Ocular habronemasis

Gastric habronemiasis

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11
Q

Dx of Habronema spp and D.megastoma

A

Eggs in poo or larva in poo

Gastric lavage

Biopsy of lesions for cutaneous or ocular habronemiasis

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12
Q

Are L more important than adults for Habronemia spp and D.megastoma?

A

Yes

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13
Q

Draschia megastoma habitat

A

Nodules in wall of stomach

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14
Q

Ascarid or roundworm of horses

A

Parascaris equorum

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15
Q

Habitat of Parascaris equorum

A

Small intestine….HUGE worms

or due to abnormal migratin, bile ducts

L can be in kidneys or CNS

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16
Q

Does O.equorum normally affect foals or adults?

A

Foals

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17
Q

Life cycle of P. equorum

A

Direct

Eggs in poo
L3 is ingested and travels via hepatic portal system to heart and lungs where it’s swallowed and reaches small intestine as adult.

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18
Q

Patho of P.equorum

A

Mild liver rxns

Severe lung rxns (subpleural lymphocytic nodules)

SUMMER COLDS due to hepatotrachael migration- pulmonary lesions

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19
Q

Dx of P.equorum

A

Eggs in poo or worms

Worms at necropsy

20
Q

Intestinal threadworm

A

Strongyloides westeri

21
Q

Host of S. westeri

A

Horse, donkey, pig

22
Q

Only known parthenogenetic female

A

S. westeri

23
Q

Life cycle of S. westeri

A

Homogenic

  • Direct
  • Egg in poo, L3 penetrates skin OR transcolostrally transmitted
  • Lung->trachea->small intestine

Heterogenic

  • Egg in poo
  • FREE LIVING
24
Q

Patho of S. westeri

A

Migration can have acute pulmonary disease

Enteritis (colic)

Foal heat diarrhea
(BUT PROBS DUE TO INCREASED FIBER AND CHANGES IN INTESTINAL FLORA….corresponds to mare’s first post-parturient estrus)

25
Q

Dx of S. westeri

A

Eggs in poo

Female worms in necropsy

26
Q

Are foals or adults more affected by S. westeri

A

Foals

27
Q

Large equine pinworm

A

Oxyuris equi

28
Q

Habitat of O.equi

A

Large intestnie

29
Q

Life cycle of O. equi

A

Direct

  • Eggs in perianal area
  • Eggs ingested
  • L go to crypts in large intestine and develop into adults
30
Q

Patho of O.equi

A

Larvae may cause locaized tissue rxn (adults nonpatho)

Pruritis ani/seat itch

Hair loss, hyperkeratosis, secondary bacterial infections

31
Q

Dx of O. equi

A

Eggs in perineum or poo

32
Q

Equine lungworm

A

Dictyocaulus arnfieldi

33
Q

Host of Dictyocaulus arnfieldi

A

Donkey (natural host)

34
Q

Habitat of dictyocaulus arnfieldi

A

Bronchi and bronchioles

35
Q

Life cycle of dictyocaulus arnfieldi

A

Egg in poo
L ingested and penetrate intestinal wall
Migrates lymphatic to thoracic duct
Mature in lungs

36
Q

Patho of D. arnfieldi

A

Verminous pneumonia

37
Q

Equine eyeworm

A

Thelazia lacrymalis

38
Q

Habitat of T. lacrymalis

A

Conjuctival sac and lacrymal ducts

39
Q

Life cycle

A 
Indirect
Egg in poo
L ingested by face fly
Fly deposits L1
Adult matures in eye
40
Q

Patho of T. lacrymalis

A

Conjuctivits

keratitis

41
Q

Neck Threadworm

A

Onchocerca cervicalis

42
Q

Onchocera cervicalis habitat

A

MF in skin

Adults in nuchal ligament

43
Q

Onchocerca cervicalis LC

A

Adult makes MF
MF ingested by midges
MF develop into larvae
Larvae develops into adults

44
Q

Patho of O. cervicalis

A

Nodules in nuchal ligament

MF cause dermattis

ocular dsease (periodic ophthalmia, moon blindness, recurrent iridocyitis)

45
Q

Does O. cervicalis cause fistulous withers?

A

No

46
Q

Micronema deletrix other names

A

Halicephalobus deletrix

Halicephalobus gingivalis

47
Q

Micronema deletrix habitat

A

CNS

Kidney

Parasitology (6 decks)

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