Amoebiasis is an intestinal infection caused by the protozoan parasite Entamoeba histolytica. It affects millions of people globally, particularly in areas with poor sanitation and unsafe drinking water supplies. While many infected individuals remain asymptomatic, others develop severe dysentery or extra-intestinal abscesses. Recognizing the clinical spectrum early helps prevent life-threatening tissue destruction in vulnerable populations across Nigeria.
Once ingested, cysts excyst in the terminal ileum or colon, releasing trophozoites that attack the intestinal mucosa. These trophozoites secrete lytic enzymes that destroy epithelial cells, producing characteristic flask-shaped ulcers in the large intestine. Patients typically present with abdominal pain, cramping, and stool containing blood and mucus, commonly referred to as amoebic dysentery. Unlike bacterial dysentery, high fever is less common, but tenesmus—a painful and ineffective straining to pass stool—frequently occurs.
Stool microscopy remains a primary diagnostic tool, where identifying cysts confirms infection and finding red blood cells inside active trophozoites confirms tissue invasion. Because stool shedding can be intermittent, laboratories often require three consecutive stool samples. Serological tests like enzyme-linked immunosorbent assay (ELISA) detect circulating antibodies, proving especially useful for diagnosing extra-intestinal infections such as liver abscesses. Ultrasound and computed tomography scans help visualize focal lesions within the hepatic parenchyma.
Pharmacological treatment requires a two-step approach because single drugs rarely eliminate both tissue-invading organisms and luminal cysts. Tissue amebicides, such as metronidazole or tinidazole, clear trophozoites from the bowel wall and liver abscesses. Luminal agents, such as diloxanide furoate, must follow to eradicate remaining cysts in the intestinal lumen and prevent relapse. Nursing care centers on monitoring hydration status, recording exact stool frequency and character, administering analgesics, and providing rigorous health education on hand hygiene.
Preventing amoebiasis relies heavily on breaking the fecal-oral transmission chain within communities. Public health measures include improving municipal water treatment, constructing safe sanitary latrines, and promoting proper handwashing practices before eating and after using the toilet. Food safety education is equally vital, emphasizing thorough washing of raw fruits and vegetables and protecting food from flies. Public health nurses play a central role in conducting community outreach and hygiene campaigns to reduce infection rates.