Capillaria spp.

(aka., Hairworm, Threadworm, Pearsonema spp., Aonchotheca spp., and Eucoleus spp.)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 45–50 × 22–25 μm

Cryptosporidium spp.

(aka., Coccidia)
Method of Detection:
  • Acid-fast stain of fecal smear
  • Fecal float (with Sheather's sugar)
​
Size:
  • Oocyst: 4–7 × 4–5 μm

Dicrocoelium dendriticum

(aka., Small Lanceolate Fluke, Common Lancet Fluke, Small Liver Fluke, Dicrocoelium lanceatum)
Method of Detection:
  • Fecal sediment
​
Size:
  • Egg: 38–45 × 22–30 μm

Dictyocaulus viviparus

(aka., Cattle Lungworm)
Method of Detection:
  • Baermann (fresh feces)
​
Size:
  • First-stage larva: 300–360 μm

Eimeria spp.

(aka., Coccidia)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Oocyst: 12–45 μm long

Eurytrema spp.

(aka., Pancreas Fluke, Distoma pancreaticum, Eurytrema ovis)
Method of Detection:
  • Fecal sediment
​
Size:
  • Egg: 40–53 × 23–36 μm

Fasciola hepatica

(aka., Liver Fluke)
Method of Detection:
  • Fecal sediment
​
Size:
  • Egg: 130–150 × 63–90 μm

Fascioloides magna

(aka., Large American Liver Fluke)
Method of Detection:
  • Fecal sediment
​
Size:
  • Egg: 109–168 × 75–96 μm

Giardia sp.

(aka., Giardia duodenalis, Giardia intestinalis, Lamblia lamblia)
Method of Detection:
  • Fecal float for cysts (centrifugal in ZnSO4) (± Lugol's iodine)
  • Saline fecal smear of fresh feces for trophozoite (± Lugol's iodine)
​
Size:
  • Cyst: 8–13 × 7–10 μm
  • Trophozoite: 12–17 × 5–10 μm

Moniezia spp.

(aka., Common Ruminant Tapeworm, Double-pored Ruminant Tapeworm, Sheep Tapeworm)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 65–75 μm diameter

Nematodirus spp.

(aka., Thread-Necked Strongyle)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 152–260 × 67–120 μm

Paramphistomum spp.

(aka., Rumen Fluke)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 114–175 × 65–100 μm

'Strongyle' Type Ova

(aka., Ostertagia, Haemonchus, Cooperia, Trichostrongylus, Mecistocirrus, Oesophagostomum, Bunostomum, Chabertia, others)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 65–100 × 34–50 μm (depending on species)

Strongyloides papillosus

(aka., Threadworm)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 40–60 × 20–40 μm

Toxocara vitulorum

(aka., Roundworm, Neoascaris vitulorum)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 75–95 × 60–75 μm

Trichuris spp.

(aka., Whipworm)
Method of Detection:
  • Fecal float (centrifugal >>> simple)
​
Size:
  • Egg: 70–90 × 30–42 μm

Tritrichomonas foetus

(aka., Trich, Trichomonas foetus)
Method of Detection:
  • Cytology of preputial scrapings, vaginal secretions, or cervical secretions (culture is recommended)
​
Size:
  • Trophozoite: 10–25 × 3–15 μm
Sources Cited:
  1. Zajac, Anne M., and Gary A. Conboy. Veterinary Clinical Parasitology. 8th ed. West Sussex: John Wiley & Sons, 2012. Print.
  2. Taylor, Mike A., R. L. Coop, and Richard L. Wall. Veterinary Parasitology. 4th ed. Chichester, West Sussex: Wiley Blackwell, 2016. Print.
  3. American Association of Veterinary Parasitologists. (2010). Retrieved 2019, from https://www.aavp.org.

© Lance Wheeler, 2018–2019