Fecal Examination in Parasitology
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Questions and Answers

What is the purpose of fecal examination in veterinary helminthology?

To provide evidence of or accurate identification of most of the parasites which inhabit the alimentary tract.

Which of the following might appear in feces as pseudoparasites? (Select all that apply)

  • Plant hairs (correct)
  • Parasite eggs
  • Pollen grains (correct)
  • Mold spores (correct)

Fresh feces should be used for fecal sample collection to avoid __________.

dehydration

Old fecal samples can be useful for accurate microscopic examination.

<p>False (B)</p> Signup and view all the answers

Which technique is NOT a method for qualitative microscopic examination of feces?

<p>Stoll Ova-Counting Technique (D)</p> Signup and view all the answers

What characteristics are described for the family Fasciolidae?

<p>The body is large and leaf-like, with suckers close together at the anterior end.</p> Signup and view all the answers

Fasciolidae are considered hermaphrodites.

<p>True (A)</p> Signup and view all the answers

Which of the following are common helminth eggs found in pigs? (Select all that apply)

<p>Trichuris suis (A), Ascaris suum (B)</p> Signup and view all the answers

Study Notes

Fecal Examination in the Diagnosis of Parasitism

  • Fecal examines provide evidence of or identify parasites found in the alimentary tract
  • Parasites of the respiratory tract can be diagnosed through fecal examination
  • Fecal exams can reveal the status of digestion

Pseudoparasites

  • Objects in the feces that mimic parasites are known as pseudoparasites
  • Pollen grains, plant hairs, grain mites, mold spores, and other plant or animal debris can be found in feces
  • Spurious parasites are also encountered, which can include parasite eggs or cysts that are found in the feces of scavenger or predator hosts due to coprophagy

Fecal Sample Collection

  • Always use fresh feces when collecting samples
  • If the sample is kept for an extended period of time it may become dehydrated making suspension difficult
  • Old samples may disintegrate, hatch or develop which can disrupt diagnosis
  • If the sample is transported for more than a few hours it must be preserved using 10% formalin and refrigerated

Microscopic Examination of Feces

  • There are three types of microscopic examination: simple fecal smear method, qualitative microscopic concentration methods of fecal examination, and quantitative methods of fecal examination

Simple Fecal Smear Method

  • This method is a simple direct smear method that allows visualization of parasites

Qualitative Microscopic Concentration Methods of Fecal Examination

  • Sugar Flotation Technique
  • Willi’s Brine Flotation Technique
  • Modified Fluke Egg Technique

Quantitative Methods of Fecal Examination

  • Stoll Ova-Counting Technique
  • McMaster Egg-Counting Technique
  • Beaver’s Direct Egg-Count Technique
  • Larval Culture of Sheep and Goat
  • Baermann Apparatus
  • Filter Paper Strips

Common Helminth Eggs in Ruminants

  • Eggs of various helminths are found in the feces of ruminants

Common Helminth Eggs in Pigs

  • Eggs of various helminths are found in the feces of pigs

Common Helminth Eggs in Poultry

  • Eggs of various helminths are found in the feces of poultry

Common Helminth Eggs in Horses

  • Eggs of various helminths are found in the feces of horses

Common Helminth Eggs in Dogs & Cats

  • Eggs of various helminths are found in the feces of dogs and cats

Common Helminth Eggs in Rabbits

  • Eggs of various helminths are found in the feces of rabbits

Common Helminth Eggs in Rodents

  • Eggs of various helminths are found in the feces of rodents

Common Helminth Eggs in Reptiles

  • Eggs of various helminths are found in the feces of reptiles

The Family Fasciolidae

  • The body is large and leaf-like, with suckers close together at the anterior end
  • Parasites of the liver and bile ducts of herbivorous mammals and man
  • They are hermaphrodites
  • Ovary and testes are dendritic
  • Eggs have a large operculum

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Description

This quiz covers the role of fecal examinations in diagnosing parasitism, including identification of actual parasites and pseudoparasites. It discusses the importance of fresh samples and proper collection methods to ensure accurate results. Assess your knowledge on fecal sample analysis and the implications of findings.

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