Parasitology - Trematoda

O Great St. Joseph of Cupertino who while on earth

did obtain from God the grace to be asked at your

examination only the questions you knew, obtain for

me a like favors in the examinations for which I am

now preparing. In return I promise to make you

known and cause you to be invoked.

Through Christ our Lord.

St. Joseph of Cupertino, Pray for us.

Amen.

Trematoda

Lung trematode

Paragonimuswestergani

Intestinal trematode

Clonorchissinensis

Fasciolahepatica

Scistasomiasis

Schistosomahaematobium

Schistosomajaponicum

Schistosomamansoni

JMJ 2

Paragonimus westermani• Size: About 12mm in length.

• Shape: Oval, coffee-bean shaped.

• Oral sucker: Terminal.

• Ventral sucker: In the middle of the body.

• Gut caeca: Wavy, not branched (simple) and end blindly.

• Testes: Lobed and lie side by side in posterior 1/3 of the body.

• Ovary: Lobed, anterior to testes on right side opposite to closely coiled uterus.

• Vitellaria: Extend from anterior to posterior end.

JMJ 3

Paragonimus westermani

JMJ 4

Paragonimus westermani

• Size: 100 mm (smaller than the egg of giant liver fluke)

• Shape: Oval with a slight flattening in one pole.

• Shell: Has a distinct thickening at opposite end to the operculum.

• Operculum: Quite distinct, with an obvious ring.

• Content: Clear central space surrounded by squarish cells.

• Colour: Golden brown.

JMJ 5

Clonorchis sinensis - (Oriental liver fluke )• Size: 6-20mm.

• Shape: Elongated leaf shaped.

• Oral sucker: Terminal.

• Ventral sucker: Lying about 1/4 the length of the body from anterior end.

• Gut caeca: Extend to the posterior end.

• Testes: Deeply lobed, lie one behind the other in posterior 1/2 of the body.

• Ovary: Small, anterior to the testes in the midline.

• Vitellaria: Confined to the lateral mid position of the body.

JMJ 6

Clonorchis sinensis - (Oriental liver fluke )

JMJ 7

Clonorchis sinensis - (Oriental liver fluke )• Size : 25 -30um.

• Shell : Smooth, Fine and Thick(Can see double lines).

• A small knob at the wide end of the egg.

• Operculum: Easily visible at the narrow end of the egg, fitting into a thickened rim of the shell.

• Content : A well organised ciliated embryo.

• Colour : Shell - Yellowis brown.

• Contents : Pale yellow.

JMJ 8

Fasciola hepatica ( Sheep liver fluke)• Size : 20-30mm x 8-13mm.

• Shape : Flat leaf shaped with shouldered appearance from conical anterior projection (cephalic cone).

• Oral sucker : Terminal, on the cephalic cone. Same size of ventral sucker.

• Ventral sucker : Within anterior 1/3 of body.

• Same size of oral sucker.

• Gut caecae : Highly branched, end blindly.

• Testes : Highly branched, placed one behind the other.

JMJ 9

Fasciola hepatica ( Sheep liver fluke)

JMJ 10

Scistasomia adult

JMJ 11

Schistosoma haematobium

• Size : 120 -150um.

• Shape : Oval with one well rounded pole.

• Spine : Terminal.

• Shell : Smooth, very thin.

• Content : A well formed ciliated embryo surrounded by a internal shell.

• Colour : Grey or pale yellow.

JMJ 12

Schistosoma haematobium

JMJ 13

Schistosoma japonicum

• Size : 70 - 80 um.

• Shape : Oval, almost rounded.

• Spine : Difficult to see, lateral and very small.

• May be hidden by small granules often found on the surface of the egg.

• Content : A broad ciliated embryo.

• Colour : Transparent or pale yellow.

JMJ 14

Schistosoma japonicum

JMJ 15

Schistosoma mansoni

• Size : 150um.

• Shape : Oval with one well rounded pole and a one conical pole.

• Shell : Smooth and very thin.

• Spine : Lateral near the rounded pole, large and triangular.

• Content : A ciliated embryo surrounded by an internal shell.

JMJ 16

Schistosoma mansoni

JMJ 17

Thank You!

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