Eggs Flashcards by Hannah Shaw

Q

A

Opisthorchis ova - liver fluke

Operculum

shoulders

miracidium

small knob may be seen

25-30um

brown/orange colour

oval shape

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Q

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Taenia ova - cestode/ tapeworm

30-45um

round shape and brown

thick striated wall

embryo hooklets

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Q

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Hymenoleptis

35-45um

round and pale in colour

hooklets of embryo

polar filaments

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Q

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Trichuris trichiura whipworm

50-55um

polar mucoid plugs

unsegmented ovum

oval shape and brown

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Q

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Enterobius vermicularis - pinworm

colourless oval with one side flattened

55um

not often found in faecal as often taken directly from the rectum

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Q

A

Fertile ascaris lumbricoides egg

55-65um

yellow brown round/oval

corticated albumin coat (may be decorticated due to breakdown by stomach biles)

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Q

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Hookworm

colourless oval

60-70um

segmented ovum

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Q

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Diphyllobothorium latum

65-70um

yellow oval

operculum

yolk cells

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Q

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Infertile ascaris lumbricoides

85-90

yellow brown oval darker than fertile

corticated albumin coat

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Q

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Schistosoma japonicum

80-90um

pale yellow or colourless

oval

miracidium

rudimentary spine may be seen

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paragonimus

70-110um

operculated and asymmetrical

thickened wall

yolk cells

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Schistosoma mansoni

120-140um

miracidium

lateral spine

pale yellow or colourless

large and oval

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Q

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Schistosoma haematobium

110-140um

terminal spine

miracidium

pale yellow or colourless

large and oval

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Q

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Fasciola

120-140um

yellow brown

large oval

operculum

yolk cells

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