👉 Oesophagocystis is a bacterium that produces large, cystic sacs called oesophagocysts. These sacs are typically found in the lining of the small intestine and can contain toxins or other harmful substances from the bacteria themselves. The presence of these sacs can lead to symptoms such as diarrhea, bloating, abdominal pain, nausea, and even death if left untreated.