vpg logo Parasitology
Lab Keys

Equine
Parasite Diagnostic Key

1. Egg with a rough shell ........ Go to: 3 & 4
2. Egg with a smooth shell ........ Go to: 5 & 6

3. Angular egg (D-shaped, square) .......... Anoplocephala sp.
4. Roundish egg .......... Parascaris equorum

5. Egg with a single plug .......... Oxyuris equi
6. Egg withOUT a plug .......... Go to: 7 & 8


7. Embryonated or larvated egg .......... Strongyloides westeri
8. Morulated egg .......... Strongyle-type Egg

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NC State College of Veterinary Medicine
1060 William Moore Drive
Raleigh, NC 27607