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ID#:1543
Description:Magnified 128X, this photomicrograph revealed some of the ultrastructural features displayed by a fertilized, decorticated Ascaris lumbricoides egg. A. lumbricoides is the largest nematode (roundworm) parasitizing the human intestine.
Fertilized and unfertilized A. lumbricoides eggs are passed in the stool of the infected host. Fertilized eggs are are rounded and have a thick shell with an external mammillated layer that is often stained brown by bile. In some cases, the outer layer is absent (known as decorticated eggs). Fertile eggs range from 45µm to 75µm in length. Unfertilized eggs are elongated and larger than fertile eggs (up to 90µm in length). Their shell is thinner and their mammillated layer is more variable, either with large protuberances or practically none. Unfertile eggs contain mainly a mass of refractile granules.
High Resolution: Click here for hi-resolution image (6.65 MB)
Content Providers(s):CDC/ Dr. Mae Melvin
Creation Date:1979
Photo Credit:
Links:CDC – Div. of Parasitic Diseases: Ascariasis
Categories:
CDC Organization
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Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.

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