Answer to Case 553

Answer toParasite Case of the Week 553:Ascaris lumbricoidesThe overall appearance and large size of this nematode are strongly suggestive ofA. lumbricoides, given that this is a human stool specimen. As Sam mentioned, examining the anterior end for the characteristic 3 fleshy lips common to all ascarids, and examination of the stool for eggs would allow for confirmation of the identification.Here are some images from other cases to show these characteristic features:Adult with 3 fleshy lips fromCase of the Week 479:Mammillated and decorticated eggs fromCase of the Week 550Thanks to all that wrote in with the answer, and to Dr. Poloni for donating this case!
Source: Creepy Dreadful Wonderful Parasites - Category: Parasitology Source Type: blogs