Parasitology

Hymenolepis nana Eggs in Stool: Microscopy in Hymenolepiasis

Morphology of dwarf tapeworm (Hymenolepis nana) eggs during stool microscopy. Laboratory diagnosis of hymenolepiasis, features of oncosphere and hooks.

🔬Stool microscopy. ❗In the photo: Hymenolepis nana is a parasite of the class Cestoda (resembles a tapeworm) measuring 15 to 40 mm. It is the most common cestode, primarily affecting children. It infects humans and rodents, causing hymenolepiasis. Severe infection in humans can cause severe diarrhea, weight loss, malnutrition, dehydration, and severe abdominal pain. It is the only cyclophyllidean that infects humans without the need for an intermediate host.