Entamoeba histolytica is a single-celled parasite that causes amoebic dysentery, a severe intestinal infection. It is primarily transmitted through contaminated food and water, particularly in areas with poor sanitation. Once ingested, the parasite can invade the intestinal lining, leading to symptoms such as diarrhea, abdominal pain, and fever. In addition to gastrointestinal issues, Entamoeba histolytica can also spread to other organs, such as the liver, causing abscesses. Diagnosis typically involves stool tests or imaging studies, and treatment usually includes medications like metronidazole or tinidazole to eliminate the infection.