**Question:** Which of the following is not true about amoebiasis?

A. Amoebiasis is caused by the protozoan parasite Entamoeba histolytica.
B. The infection is primarily transmitted through contaminated food and water.
C. Symptoms include diarrhea, abdominal pain, and fever.
D. Diagnosis is based on microscopic examination of stool samples.

**Correct Answer: Option A -** Amoebiasis is NOT primarily transmitted through contaminated food and water.

**Core Concept:** Amoebiasis is an infection caused by the protozoan parasite Entamoeba histolytica, which primarily affects the gastrointestinal tract. The parasite is commonly transmitted through the fecal-oral route, involving ingestion of cysts present in contaminated food or water.

**Why the Correct Answer is Right:** Despite the misconception, amoebiasis is primarily acquired through ingestion of cysts from contaminated food or water, not directly through contact with infected individuals.

**Why Each Wrong Option is Incorrect:**

**Option B:** The statement about the mode of transmission is incorrect, as it highlights that amoebiasis is transmitted through contaminated food and water.

**Option C:** While the other symptoms are indeed present in amoebiasis, the statement that all symptoms are limited to these is incorrect. Amoebiasis may present with additional manifestations like liver abscess, which is caused by the parasite's ability to form cysts and invade tissues.

**Option D:** Diagnosis of amoebiasis is typically based on the microscopic examination of stool samples for the presence of Entamoeba histolytica or its cysts (Entamoeba dispar). However, the statement "Diagnosis is based on microscopic examination of stool samples" is a generalization, as other diagnostic methods like serology, enzyme-linked immunosorbent assay (ELISA), and molecular techniques are also employed in practice.

**Clinical Pearl:** Understanding the correct mode of transmission of amoebiasis will help differentiate it from other enteric infections and guide appropriate infection control measures. Remember that while amoebiasis can present with gastrointestinal symptoms, it can also manifest as liver abscess due to the parasite's invasive nature. Additionally, while microscopic examination of stool samples is a diagnostic method, other techniques like serology, ELISA, and molecular tests are also employed.