This micrograph reveals an egg of tapeworm cestode parasite Diphyllobothrium latum.
Diphyllobothrium sp. unembryonated eggs (58-76µm x 40-51µm) passed in the stool, are oval or ellipsoidal with an operculum at one end that can be inconspicuous. At the opposite (abopercular) end is a small knob that can be barely discernible.
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Some of the images on this website are in the public domain.