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.
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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