Giardia lamblia -LRB- synonymous with Lamblia intestinalis and Giardia duodenalis -RRB- is a flagellated protozoan parasite that colonises and reproduces in the small intestine , causing giardiasis .

Giardia lamblia -LRB- synonymous with Lamblia intestinalis and Giardia duodenalis -RRB- is a flagellated protozoan parasite that infects the gastrointestinal tract and causes giardiasis .
