What does amoebiasis mean?
Amoebiasis is a parasitic infection of humans caused by the single-celled organism Entamoeba histolytica, an amoeba transmitted through food or water contaminated with infected faecal matter. Most infections affect the large intestine, where they may cause no symptoms at all or produce abdominal pain, diarrhoea, and — in severe cases — amoebic dysentery, marked by bloody stools. In some patients the parasite spreads beyond the gut, most often forming an abscess in the liver. Amoebiasis is chiefly a disease of areas with inadequate sanitation, though travellers and migrants may carry it worldwide. Diagnosis relies on stool testing or serology, and effective treatment exists with drugs such as metronidazole combined with a luminal agent. The word derives from 'amoeba', itself rooted in the Greek 'amoibē', meaning change or exchange — apt for an organism famous for its shifting shape. It is a formal medical term, familiar mainly within public health and tropical medicine.
nounAn infection of the intestines (and sometimes other organs) caused by the parasitic amoeba Entamoeba histolytica, typically transmitted through contaminated food or water.
- Infection of the intestines caused by the parasitic amoeba Entamoeba histolytica, ranging from asymptomatic carriage to dysentery and colitis.
- Extraintestinal disease caused by spread of Entamoeba histolytica beyond the gut, most commonly as an amoebic liver abscess.
"Travellers to regions with poor sanitation were advised to boil drinking water to avoid contracting amoebiasis."
"The clinic treated several cases of amoebiasis among workers who had drunk untreated well water."
"Untreated intestinal amoebiasis can occasionally progress to an abscess in the liver."
Rarely used; the singular form normally suffices when referring to the disease in general or to individual cases collectively.
"The hospital recorded several amoebiases over the course of the rainy season."
The word 'amoebiasis' hides a Greek shape-shifter inside it: 'amoeba' comes from 'amoibē', meaning 'change' — a fitting name for a parasite that constantly alters its form.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of amoebiasis
Amoebiasis is formed from 'amoeba', the name of the shape-shifting protozoan genus, plus the suffix '-iasis', which in medical terminology denotes a disease or infestation. The name 'amoeba' was coined in the 19th century from the Greek 'amoibē', meaning 'change' or 'exchange', reflecting the organism's constantly altering form. The '-iasis' suffix ultimately traces back to Greek as well, giving the word its classical pedigree despite being a product of modern scientific naming. American medical literature typically spells the condition 'amebiasis', reflecting the simplified American spelling of 'amoeba'.
Related word forms
How amoebiasis is actually used
A clinical and medical term used in formal contexts such as medicine, public health, and epidemiology; rarely encountered in everyday conversation. The spelling 'amebiasis' is standard in American medical usage, while 'amoebiasis' is more common in British and international (WHO) sources. The related spelling variant 'amoebiosis' also exists but is less common.
Easily confused with amoebiasis
Dysentery is a general term for bloody diarrhoea from various causes, whereas amoebiasis specifically refers to infection by Entamoeba histolytica — though severe amoebiasis can present as amoebic dysentery.
Giardiasis is an intestinal infection caused by the flagellate parasite Giardia lamblia, not by an amoeba.