Disease
Amebiasis
Bloody dysentery plus liver abscess
am-uh-BYE-uh-sis
High-yield clue
Bloody dysentery with flask-shaped colonic ulcers and a possible right-upper-quadrant 'anchovy-paste' liver abscess is the classic amebiasis clue.
Overview
A colonic protozoal infection by Entamoeba histolytica, studied for invasive bloody dysentery and its extraintestinal liver abscess.
Classification
- Protozoal enteric syndrome
- Entamoeba histolytica infection
- Fecal-oral cyst ingestion
- Invasive and inflammatory
Lab & identification clues
- Trophozoites with ingested red cells (erythrophagocytosis) vocabulary
- Flask-shaped colonic ulcer vocabulary
- Serology and stool antigen concept
Associations
- Transmission: fecally contaminated food/water and oral-anal contact
- Amebic dysentery with bloody stools and abdominal pain
- Amebic liver abscess ('anchovy paste') vocabulary
- Endemic where sanitation is poor / tropical regions
Commonly confused with
- Bacillary dysentery (Shigella)
- Giardiasis
- Nonpathogenic Entamoeba dispar
Frequently asked questions
What is Amebiasis?
A colonic protozoal infection by Entamoeba histolytica, studied for invasive bloody dysentery and its extraintestinal liver abscess.
What is the high-yield clue for Amebiasis?
Bloody dysentery with flask-shaped colonic ulcers and a possible right-upper-quadrant 'anchovy-paste' liver abscess is the classic amebiasis clue.
What is Amebiasis associated with?
Amebiasis is associated with Transmission: fecally contaminated food/water and oral-anal contact, Amebic dysentery with bloody stools and abdominal pain, Amebic liver abscess ('anchovy paste') vocabulary, and Endemic where sanitation is poor / tropical regions.
What is Amebiasis commonly confused with?
Amebiasis is commonly confused with Bacillary dysentery (Shigella), Giardiasis, and Nonpathogenic Entamoeba dispar.
Original student-study summary. Sources checked: OpenStax Microbiology 2e, NCBI Bookshelf Medical Microbiology, and CDC topic pages where applicable; reviewed 2026-06. Educational only; no diagnosis, treatment, dosing, or specimen-handling guidance.