Ascaris suum

(aka., Large Roundworm)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 50–70 × 40–60 μm

Ascarops strongylina

(aka., Thick Stomach Worm, Arduenna strongylina)
Method of Detection:
  • Fecal sediment
​
Size:
  • Egg: 39–45 × 17–26 μm (Note: eggs appear identical to Physocephalus sexalatus)

Balantidium coli
Method of Detection:
  • Fecal float (simple or centrifugal)
  • Saline fecal smear of fresh feces
​
Size:
  • Cyst: 40–60 μm
  • Trophozoite: 50–150 μm (1)

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

Cystoisospora suis

(aka., Isospora suis)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Oocyst: 17–25 × 16–22 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

Diphyllobothrium latum

(aka., Broad Tapeworm, Dibothriocephalus latus)
Method of Detection:
  • Fecal sediment
​
Size:
  • Egg: 58–76 × 40–51 μm

Eimeria spp.

(aka., Coccidia)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Oocyst: 11–35 × 9–20 μm

Entamoeba histolytica

(aka., Entamoeba dysenteriae, Endamoeba histolytica)
Method of Detection:
  • Saline fecal smear of fresh feces (± Lugol's iodine, Wright's stain, or Giemsa stain)
​
Size:
  • Cyst: 10–12 μm
  • Trophozoite: 12–30 μm

Fasciola hepatica

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

Macracanthorhynchus hirudinaceus

(aka., Thorny‐Headed Worm)
Method of Detection:
  • Fecal sediment >>> Fecal float
​
Size:
  • Egg: 67–110 × 40–65 μm

Metastrongylus spp.

(aka., Swine Lungworm)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 51–63 × 33–42 μm (1)

Paragonimus kellicotti

(aka., Lung Fluke)
Method of Detection:
  • Fecal sediment >>> Fecal float
  • Cytologic examination of bronchial mucous
​
Size:
  • Egg: 75–118 × 42–67 μm

'Strongyle' Type Ova

(aka., Oesophagostomum spp. [Nodular Worm] and Hyostrongylus rubidus [Red Stomach Worm])
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 69–85 × 39–45 μm

Strongyloides spp.

(aka., Threadworm)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 40–50 × 20–35 μm

Trichuris suis

(aka., Swine Whipworm)
Method of Detection:
  • Fecal float (simple or centrifugal)
​
Size:
  • Egg: 50–60 × 21–25 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