**Question:** Which of the following is TRUE about Acute Primary Amoebic Meningoencephalitis?

A. It is caused by the protozoan parasite, Naegleria fowleri.
B. It is a rare condition that primarily affects children under the age of 15.
C. It has a high mortality rate of around 90%.
D. It is mainly transmitted through contaminated water.

**Correct Answer: C. Acute Primary Amoebic Meningoencephalitis (APAM) has a high mortality rate of around 90%.**

**Core Concept:** Acute Primary Amoebic Meningoencephalitis (APAM) is a severe, rapidly progressive, and life-threatening neurological infection caused by the protozoan parasite Naegleria fowleri. Naegleria fowleri is a thermoflagellate that is commonly found in warm freshwater bodies, such as lakes, ponds, and rivers.

**Why the Correct Answer is Right:** APAM is a rare condition, but it can occur in any age group. Infection usually occurs when the parasite enters the body through the nasal cavity and travels to the central nervous system (CNS), causing inflammation and damage to the brain and meninges. The high mortality rate of around 90% is mainly due to the rapid invasion and destruction of brain tissue by Naegleria fowleri, leading to severe neurological symptoms and complications.

**Why Each Wrong Option is Incorrect:**

A. While the parasite Naegleria fowleri is responsible for APAM, the statement about affecting children under the age of 15 is incorrect. APAM can affect individuals of any age, including infants, adults, and the elderly.

B. The transmission of APAM is not primarily via contaminated water consumption. Although the parasite is commonly found in warm freshwater bodies, infection typically occurs when a person comes into contact with the water through activities like swimming, diving, or nasal irrigation.

D. Contaminated water is sometimes a mode of transmission, but it is not the primary mode. The infection usually occurs when the parasite enters the body through the nasal cavity, as mentioned above.

**Clinical Pearl:** APAM is a severe infection that can be potentially life-threatening. To prevent APAM, it is essential to avoid activities that expose the upper respiratory tract to warm freshwater bodies, such as swimming or nasal irrigation. In the event of a suspected infection, immediate medical attention should be sought as the disease progresses rapidly and carries a high mortality rate.