amebic dysentery

Amebic dysentery, also known as intestinal amebiasis, is an intestinal infectious disease caused by the protozoan Entamoeba histolytica parasitizing the colon. The lesions are mainly located in the cecum and proximal colon. Clinically, it is characterized by abdominal pain, diarrhea, and passage of dark red jam-like stools. This disease tends to become chronic and can cause complications such as amebic liver abscess. Amebic dysentery is distributed worldwide, being more common in tropical and subtropical regions, where more virulent strains are also concentrated, showing stable endemicity. The infection rate is related to socioeconomic level, sanitary conditions, and population density. For example, the infection rate is 0%–10% in developed temperate countries, while it can exceed 50% in tropical developing countries, with more rural than urban patients. It is more common in summer and autumn, more frequent in males than females, with a typical age peak in adolescence or young adulthood. It is mostly sporadic, with occasional waterborne epidemics. In recent years, acute amebic dysentery and liver abscess cases in China have become relatively rare except in certain regions, with infection rates in some areas falling below 10%. The prognosis of amebic dysentery is generally good, depending on the duration of the disease, presence of complications, and whether early diagnosis and timely effective treatment are provided. Patients with fulminant disease, cerebral metastatic abscess, intestinal perforation, or diffuse peritonitis have a poorer prognosis.