Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
Giardia lamblia is a unicellular eukaryotic parasite that causes giardiasis, a common gastrointestinal infection. It primarily inhabits the small intestine of humans and other mammals.
5 Must Know Facts For Your Next Test
Giardia lamblia has two life stages: the cyst and the trophozoite.
The infection is often transmitted through contaminated water or food.
It attaches to the intestinal wall using a ventral sucking disk.
Symptoms of giardiasis include diarrhea, abdominal cramps, and nausea.
Diagnosis typically involves stool sample analysis to identify cysts or trophozoites.