18 Questions
What is the characteristic shape of Trichostrongyles eggs?
Oval and thin shelled
Which parasite has eggs with a smooth brown shell wall surface and bipolar plugs?
Trichuris vulpis
What is the size range of Ancylostoma spp. eggs?
52–79 × 28–58 μm
Which parasite has microfilariae in the blood with gently tapered heads and relatively straight tails?
Dirofilaria immitis
What is the characteristic feature of Hookworm Ancylostoma spp. larvae?
Deep buccal cavity
Which parasite has eggs that are the largest among ruminant trichostrongles?
Nematodirus spp.
What can affect the concentration of eggs per gram of faeces?
The daily volume of faeces produced by the host
Why may some eggs not float well in solutions of lower specific gravity?
They are heavier than others
Which of the following parasites produces many more eggs per day than others?
Haemonchus
What can make it difficult to distinguish between eggs of different species?
The similarity in appearance of eggs from different species
What is a characteristic of nematodes?
They have a complete digestive tract
What is a characteristic of male nematodes?
They have a curved posterior end and copulatory structures
What is the purpose of leaving the counting chamber to stand for 5 minutes?
To allow the eggs to float to the surface and the debris to settle at the bottom
What is the calculation to determine the number of eggs per gram of faeces?
Count the number of eggs within the grid of each chamber and multiply by 50
Why is it important to process only a few samples at a time?
To prevent the flotation fluid from destroying delicate eggs
What is a factor that can influence the daily output of eggs by fertile female worms?
Host physiological factors such as stress or lactation
What can affect the recognition or numbers of helminth eggs found in a faecal sample?
Number of factors, including host-physiological factors and chemotherapy
What is the purpose of examining the subsample of the filtrate under the compound microscope?
To identify the type of parasite present
This quiz covers the factors affecting the concentration of parasitic eggs in faeces, including the host's daily faecal output, egg density, and species variations. Learn about the differences in egg production and flotation among various parasites, such as Fasciola, Haemonchus, and Ostertagia.
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