vpg logo Parasitology
Lab Keys

Swine
Parasite Dignostic Key

1. Round to Oval egg with a rough shell ........ Ascaris suum
2. Oval to ellipsoid egg / oocyst with a smooth shell ........ Go to: 3 & 4

3. Egg with bi-polar plugs .......... Trichuris suis
4. Egg / oocyst withOUT bi-polar plugs ........ Go to: 5, 6, & 7

5. Single-celled oocyst .......... Coccidea*
* Coccidea -- sporulate to determine Isospora sp. [2 sporocysts] or Eimeria sp. [4 sporocysts]
6. Embryonated or larvated egg .......... Strongyloides ransomi
7. Morulated egg .......... Strongyle-type Egg

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