Answer to Case 732

 Answer to the Parasite Case of the Week 732: Enterobius vermicularis (pinworm) adult female. 

As noted by Florida Fan, "Well, this is a classic situation. Children by nature are very altruistic, sharing their prize possessions (e.g., M&M’s). The asymmetric eggs with a flat side and a convex side are commonly shared in this fashion." The appearance of the eggs is also called planoconvex or "D" shaped. Anonymous mentioned that the extensive uterine reproductive system of the fertilized female worm is often completely filled with with these eggs.

If you watched the video, you could see the movement of the eggs within the uterus, and appreciate the prominent lateral alae (arrows):

Thanks again to Jessica Lin and her team for providing this fun case!