👉 Giardiasis is a disease caused by Giardia lamblia, a protozoan parasite that can infect humans and other animals. The disease is characterized by symptoms such as diarrhea, abdominal pain, fever, nausea, vomiting, and weight loss. It can also cause infections in the lungs, kidneys, and nervous system. Symptoms may vary from person to person and are often mild or unnoticeable. Treatment typically includes medications to kill Giardia lamblia and antibiotics to treat