ID#: 24110
Caption:
This illustration highlights morphologic differences between infertile and fertile Ascaris sp. ova. Infertile ova are elongated and larger than fertile eggs, measuring up to approximately 90 µm in length. Their shell is thinner, and the mammillated layer is variable, ranging from prominent protuberances to nearly absent. Infertile ova contain a mass of refractile granules. Fertile ova are more rounded and possess a thick shell with an external mammillated layer that is often bile-stained. In some cases, the outer layer is absent, and these are referred to as decorticated ova. Fertile ova typically measure 45–75 µm in length.
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Content Provider(s): CDC/ Fleisher
Creation Date: 1963
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