What type of organism is Giardia lamblia?

Giardia lamblia is categorized as a protozoan, which is a single-celled eukaryotic organism. Protozoa are characterized by their ability to move independently, often using specialized structures like flagella or cilia. Giardia lamblia specifically has a unique motility mechanism through its flagella and inhabits the intestines of various hosts, including humans, where it can cause gastrointestinal infections, often resulting in symptoms like diarrhea.

Being classified as a protozoan is essential for understanding its biology, life cycle, and the way it interacts with its host. This categorization informs treatment options and preventive measures, as protozoans have different life cycles and pathogenic mechanisms compared to bacteria, viruses, or fungi.