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Amoebae – Pathogens, Symptoms and Treatment

Amoebae are single-celled microorganisms that can cause infections in humans, most notably amoebiasis. They are found worldwide and are primarily transmitted through contaminated water or food.

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Things worth knowing about "Amoebae"

Amoebae are single-celled microorganisms that can cause infections in humans, most notably amoebiasis. They are found worldwide and are primarily transmitted through contaminated water or food.

What Are Amoebae?

Amoebae (singular: amoeba) are single-celled organisms belonging to the group of protozoa. They have no fixed body shape and move using extensions of their cell membrane known as pseudopodia. Amoebae are found in a wide range of environments, including freshwater, saltwater, soil, and the human body.

The most medically significant species is Entamoeba histolytica, the causative agent of amoebiasis – a parasitic infection that primarily affects the intestines but can also involve other organs, particularly the liver. Other species such as Naegleria fowleri and Acanthamoeba can, in rare cases, cause severe infections of the nervous system or the eyes.

Transmission and Routes of Infection

Entamoeba histolytica is transmitted primarily via the faecal-oral route, meaning infection occurs through the ingestion of cysts (the dormant, resistant form of the organism) found in:

Contaminated drinking water
Contaminated food, especially raw fruits and vegetables
Poor hand hygiene after using the toilet
Direct contact with infected individuals

Amoebiasis is especially prevalent in regions with inadequate sanitation, such as parts of Africa, South America, and Asia. Travellers visiting these areas are considered a high-risk group.

Symptoms

Many people infected with Entamoeba histolytica show no symptoms or only mild discomfort. However, in active disease, the following symptoms may occur:

Watery or bloody diarrhoea
Abdominal cramps and pain
Nausea and vomiting
Fever
Weight loss

In severe cases, intestinal amoebiasis can develop, leading to ulcerations of the intestinal wall. Extraintestinal amoebiasis occurs when amoebae spread via the bloodstream to other organs – most commonly the liver, where they can cause amoebic liver abscesses.

Diagnosis

The diagnosis of an amoeba infection is established using several methods:

Stool examination: Microscopic detection of cysts or trophozoites (the active form of the organism) in stool samples
Serology: Detection of antibodies against Entamoeba histolytica in the blood, particularly useful for extraintestinal infections
PCR testing: Molecular detection of the pathogen in stool – highly sensitive and specific
Imaging: Ultrasound or CT scanning to detect liver abscesses
Endoscopy: Used when intestinal amoebiasis is suspected, to directly assess the intestinal mucosa

Treatment

Treatment of amoebiasis depends on the form and severity of the infection:

Drug Therapy

Metronidazole or tinidazole: First-line treatments for symptomatic intestinal and extraintestinal amoebiasis; these drugs act against the active trophozoites
Paromomycin or diloxanide furoate: Used after initial therapy to eliminate remaining cysts in the intestine (known as luminal amoebicides)

Treatment of Liver Abscesses

Smaller liver abscesses often respond well to medical therapy alone. For large abscesses or cases that do not improve with medication, ultrasound-guided drainage (aspiration) may be required.

Prevention

In high-risk areas, the risk of infection can be significantly reduced by following these precautions:

Drink only boiled or bottled water
Avoid raw fruits and vegetables, or peel them yourself
Wash hands regularly and thoroughly
Only consume food from hygienically safe sources

There is currently no vaccine available against amoebiasis.

References

World Health Organization (WHO): Amoebiasis. Fact Sheet. Available at: https://www.who.int (accessed 2024)
Robert Koch-Institut (RKI): Profiles of Rare and Imported Infectious Diseases – Amoebiasis. Berlin, 2023.
Farthing M et al.: Acute diarrhea in adults and children: a global perspective. Journal of Clinical Gastroenterology, 2013; 47(1): 12–20.

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