Equine

Question 1

Parascaris equorum

Answer 1

common name - roundworm
clinical signs - most common in foals
- mild infections subclinical
severe = diarrhea, resp. distress, colic

Question 2

S.vulgaris, S. edentaus, S. equinus

Answer 2

• large strongyles aka bloodworms or redworms
• hemorrhagic inflammation of GI mucosa with multiple small ulcers
• migratory larva
• Verminous arteritis
• in extreme cases, aorta may be blocked through thrombus formation resulting in paralysis to hind limbs
• S. vulgaris is very pathogenic

Question 3

Small Strongyles - cyathostomes

Answer 3

• diarrhea
• can interfere with the normal absorptive processes of GI
• encysted cyathostomes are variably resistant to anthelmintics
• exposed to large numbers of infective larvae in spring & summer through early fall

Question 4

Strongyloides westeri

Answer 4

common name - threadworm

• diarrhea, anemia
• usually only seen in foals

Question 5

Oxyuris equi

Answer 5

common name - pinworm

- Found in perianal region of equids, causes extreme itchy butt!

Question 6

Dictycocaulus arnfieldi

Answer 6

common name - lungworm

• Infections more commonly seen in US, adult worms can cause obstruction of bronchi/bronchioles
• Symptoms usually respiratory in nature, may see bronchitis/pneumonia

Question 7

Habronema spp.

Answer 7

common name - stomach worms

• Habronema microstoma, Habronema muscae & Draschia megastoma
• Gastritis from adults affecting growth, SUMMER SORES from aberrant larvae, Ulcerative conjunctivitis from larvae
• SUMMER SORES are lesions resulting from larvae deposited by flies in wounds, found around legs, withers, male genitalia and near the eye
• spontaneously heal in the winter

Question 8

Anoplocephala perfoliata
Anoplocephala magma
Paranoplocephala mamilana

Answer 8

common name - tapeworms

- heavy A. perfoliata loads cause damage at ileoceccal junction

Question 9

Fasciola hepatica

Answer 9

common name - liver fluke
- Acute infections see hepatic trauma and even death “hepatic fascioliasis” (sudden death in sheep)
- chronic syndrome (sheep & cattle):
weight loss (both)
reduced milk yield (cattle) 
submandibular edema (sheep)
- treat with albendazole

Question 10

Eimeria leukarti

Answer 10

• a protozoa aka coccidia
• found in small intestine
• Usually asymptomatic and infections usually only seen in young animals