Faecal Sample Analyses: Sedimentation Methods

What is the purpose of the sedimentation technique in faecal sample analysis?

To detect trematode eggs in faeces.

What happens to trematode eggs in a faecal/water suspension?

They sink rapidly into the bottom.

What is the role of formalin in the sedimentation procedure?

To fix the parasites for 10 minutes.

What is the characteristic of the body of common trematodes?

Flattened. Signup and view all the answers

How do trematodes excrete waste?

Through flame cells. Signup and view all the answers

What is the characteristic of the reproductive system of most trematodes?

Hermaphroditic. Signup and view all the answers

What is the characteristic feature at the anterior end of Fasciola hepatica?

Cephalic cone Signup and view all the answers

What is the size of the egg of Fasciola hepatica?

130-150 µm long by 60-90 µm wide Signup and view all the answers

In which part of the host do adult Paramphistomum spp. flukes reside?

Rumen Signup and view all the answers

What is unique about the body shape of Paramphistomum spp. adult flukes?

Plump, not flat Signup and view all the answers

What is the stage of the trematode life cycle that is infective to the host?

Metacercaria Signup and view all the answers

What is the common name of the parasite Fascioloides magna?

Giant Deer Fluke Signup and view all the answers

What are the typical characteristics of Fascioloides magna eggs?

thick-shelled, dark brown in color, embryonated, and operculated Signup and view all the answers

What distinguishes Schistosoma haematobium eggs from those of other Schistosoma species?

Large size (110-170 µm long by 40-70 µm wide) and prominent terminal spine at the posterior end Signup and view all the answers

In which organ of cattle, goats, and sheep are Dicrocoelium dendriticum flukes typically found?

bile ducts Signup and view all the answers

What is the distinguishing feature of Schistosoma japonicum eggs?

more rounded shape and larger size (114-180 µm long by 45-70 µm wide) compared to other Schistosoma species Signup and view all the answers

What is the characteristic of hepatica eggs?

measuring 170 x 100 um Signup and view all the answers