What Is Amoebiasis Its Causes Symptoms Diagnosis and Treatment
Amoebiasis is being caused by a protozoan parasite of the large intestine of the human body whose name is Entamoeba histolytica. It is also known as amoebic dysentery. Amoebiasis lives in the large intestine of the human body and they are cosmopolitan. It produces eggs or cysts, which passes out in the body with the stool. The result of amoebiasis is diarrhea and colitis. Amoebiasis is the infection which is caused by one of the microorganisms which transmits through contaminated food or contaminated water.
Causes of Amoebiasis
Amoebiasis can be caused by living in areas which have poor sanitary conditions.
The food and water which is being contaminated by feces of infected people and if we ingest then it can cause Amoebiasis.
Amoebiasis can also be caused if you swallow the cysts of the parasite and can also be occurred by the oral – anal sexual contact with the person who is always infected.
Symptoms of Amoebiasis
Sometimes people may show zero symptoms of this disease. Generally when a person is infected with this disease, he can face mild symptoms to severe symptoms. Those symptoms can be chills, fever, weight loss, discomfort in abdomen and diarrhoea which can include the blood or mucus with then constipation.
Who is at Risk from Amoebiasis
If someone has traveled to tropical locations which have poor sanitation, they could be at risk for amoebiasis disease. Immigrants from tropical countries which have poor sanitary conditions are also at risk. People who are living in places or institutions having bad sanitary conditions just like prisons, are at the risk for this disease.
People whose immune system is not good and strong along with having other health conditions are at a risk of this disease.
How is this Disease Diagnosed
It can be diagnosed by a doctor who suspects this disease by asking the patient about the recent health conditions and travel history. Doctors can test you about the presence of E. Histolytica. For finding out the presence of cysts, a doctor may ask you to give stool samples for many days. Lab tests can also be taken for finding out the functioning of the liver and for determining if it has damaged your liver or not. Sometimes, the parasites spreads outside the intestine of human body which results in not showing up in the stool. So this is the reason, doctors also advised me to go for an ultrasound.
Treatments Available for Amoebiasis
The cases of amoebiasis which are not complicated are generally being treated by a 10 day course of metronidazole which are being taken as a capsule. Doctors also sometimes prescribe medication for controlling the nausea if the patient needs it. The cases which are complicated and have a tendency to damage the infected organs, may need surgeries.
Prevention of Amoebiasis
Proper sanitation is the main thing to consider for preventing Amoebiasis. A lot of things you need to
consider while travelling to the places where the infection is very common. The regime which needs to
look after are –
Wash your food and vegetables very carefully and properly before eating.
You should avoid eating vegetables and fruits which are not washed and peeled off properly.
You should drink the water after boiling it
Avoid eating street foods.
Avoid eating dairy products which are not pasteurised.
FAQs on Amoebiasis Infection and Intestinal Disease Overview
1. What is amoebiasis?
Amoebiasis is an infectious disease of the intestine caused by the protozoan parasite Entamoeba histolytica. It primarily affects the large intestine and may lead to diarrhea or dysentery. In severe cases, the parasite can spread to other organs such as the liver, causing liver abscesses. Amoebiasis is common in areas with poor sanitation and contaminated water supplies.
2. What causes amoebiasis?
Amoebiasis is caused by ingestion of cysts of the protozoan parasite Entamoeba histolytica through contaminated food or water. The infection occurs when:
- Mature cysts are swallowed in contaminated water or food.
- Cysts survive stomach acid and reach the intestine.
- They release active forms called trophozoites that invade the intestinal lining.
Poor hygiene and sanitation significantly increase the risk of transmission.
3. How is amoebiasis transmitted?
Amoebiasis is transmitted through the fecal–oral route by ingestion of infective cysts of Entamoeba histolytica. Transmission commonly occurs through:
- Drinking contaminated water
- Eating unwashed fruits and vegetables
- Person-to-person contact in poor sanitary conditions
- Food handled by infected individuals
The cyst form is resistant and survives outside the body, making it the main infective stage.
4. What are the symptoms of amoebiasis?
The symptoms of amoebiasis range from mild diarrhea to severe dysentery with blood and mucus in stools. Common symptoms include:
- Abdominal pain and cramps
- Loose stools or amoebic dysentery
- Fatigue and weakness
- Fever (in severe cases)
If the parasite spreads to the liver, it may cause a liver abscess with pain in the upper right abdomen.
5. What is the life cycle of Entamoeba histolytica?
The life cycle of Entamoeba histolytica involves two main stages: cyst and trophozoite. The steps include:
- Ingestion of mature quadrinucleate cysts through contaminated food or water.
- Excystation in the small intestine releasing trophozoites.
- Trophozoites multiply in the large intestine and may invade tissues.
- Encystation occurs, forming new cysts that are passed in feces.
The cyst is the infective stage, while the trophozoite is the active, disease-causing stage.
6. How does Entamoeba histolytica damage the intestine?
Entamoeba histolytica damages the intestine by invading and destroying the intestinal mucosa using enzymes. The trophozoites:
- Adhere to epithelial cells of the large intestine
- Secrete proteolytic enzymes that break down tissues
- Form characteristic flask-shaped ulcers
This tissue destruction leads to bleeding, inflammation, and symptoms of amoebic dysentery.
7. What is the difference between cyst and trophozoite in amoebiasis?
The cyst is the infective, dormant stage, while the trophozoite is the active, feeding stage of Entamoeba histolytica. Key differences include:
- Cyst: Non-motile, resistant, survives outside the body, infective stage.
- Trophozoite: Motile, feeds on host tissues and red blood cells, causes disease.
Only cysts can survive in the external environment and transmit amoebiasis.
8. How is amoebiasis diagnosed?
Amoebiasis is diagnosed by detecting Entamoeba histolytica cysts or trophozoites in stool samples. Diagnostic methods include:
- Microscopic examination of stool
- Antigen detection tests
- Serological tests for liver abscess
- Ultrasound or imaging for suspected liver abscess
Repeated stool examinations may be required for accurate diagnosis.
9. How can amoebiasis be prevented?
Amoebiasis can be prevented by maintaining proper hygiene and avoiding contaminated food and water. Preventive measures include:
- Drinking boiled or purified water
- Washing fruits and vegetables thoroughly
- Practicing regular handwashing with soap
- Improving sanitation and sewage disposal systems
Since transmission occurs through the fecal–oral route, sanitation is the most effective preventive strategy.
10. Can amoebiasis spread to other organs?
Yes, amoebiasis can spread beyond the intestine and most commonly affects the liver, causing an amoebic liver abscess. In invasive cases:
- Trophozoites enter the bloodstream from the intestine.
- They reach the liver via the portal circulation.
- They form pus-filled cavities known as amoebic liver abscesses.
Rarely, the infection may also spread to the lungs or brain, leading to serious complications.
