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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
Dx of S. westeri
Eggs in poo Female worms in necropsy
26
Are foals or adults more affected by S. westeri
Foals
27
Large equine pinworm
Oxyuris equi
28
Habitat of O.equi
Large intestnie
29
Life cycle of O. equi
Direct - Eggs in perianal area - Eggs ingested - L go to crypts in large intestine and develop into adults
30
Patho of O.equi
Larvae may cause locaized tissue rxn (adults nonpatho) Pruritis ani/seat itch Hair loss, hyperkeratosis, secondary bacterial infections
31
Dx of O. equi
Eggs in perineum or poo
32
Equine lungworm
Dictyocaulus arnfieldi
33
Host of Dictyocaulus arnfieldi
Donkey (natural host)
34
Habitat of dictyocaulus arnfieldi
Bronchi and bronchioles
35
Life cycle of dictyocaulus arnfieldi
Egg in poo L ingested and penetrate intestinal wall Migrates lymphatic to thoracic duct Mature in lungs
36
Patho of D. arnfieldi
Verminous pneumonia
37
Equine eyeworm
Thelazia lacrymalis
38
Habitat of T. lacrymalis
Conjuctival sac and lacrymal ducts
39
Life cycle
``` Indirect Egg in poo L ingested by face fly Fly deposits L1 Adult matures in eye ```
40
Patho of T. lacrymalis
Conjuctivits | keratitis
41
Neck Threadworm
Onchocerca cervicalis
42
Onchocera cervicalis habitat
MF in skin | Adults in nuchal ligament
43
Onchocerca cervicalis LC
Adult makes MF MF ingested by midges MF develop into larvae Larvae develops into adults
44
Patho of O. cervicalis
Nodules in nuchal ligament MF cause dermattis ocular dsease (periodic ophthalmia, moon blindness, recurrent iridocyitis)
45
Does O. cervicalis cause fistulous withers?
No
46
Micronema deletrix other names
Halicephalobus deletrix Halicephalobus gingivalis
47
Micronema deletrix habitat
CNS Kidney

Parasitology (6 decks)

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