👉 Microsporidium is a type of parasite that infects and damages the small intestine, causing symptoms such as diarrhea, abdominal pain, nausea, vomiting, and weight loss. It can also cause liver damage in some cases. Microsporidium is one of several types of parasites in the family of Giardia lamblia, which are known for causing giardiasis, a disease that affects both humans and animals. Microsporidium has been identified as a potential