Amebiasis
What is Amebiasis?
Amebiasis is an infection of the intestines caused by a tiny parasite called Entamoeba histolytica. This single-celled organism enters your body when you consume food or water contaminated with its cysts. The parasite can live in your large intestine and sometimes invade the intestinal lining or spread to other organs.
Most people with amebiasis have mild symptoms or no symptoms at all. When symptoms do appear, they typically affect the digestive system and can range from mild discomfort to severe illness. In rare cases, the parasite can travel through the bloodstream to the liver, lungs, or brain, causing serious complications.
This condition is most common in areas with poor sanitation and limited access to clean water. However, anyone can contract amebiasis through contaminated food, water, or direct contact with infected individuals. Early detection and treatment can prevent the infection from becoming severe or spreading to others.
Symptoms
- Diarrhea that may contain blood or mucus
- Stomach pain and cramping
- Nausea and vomiting
- Loss of appetite
- Low-grade fever
- Weight loss
- Abdominal tenderness
- Frequent bowel movements
- Fatigue and weakness
- Gas and bloating
Many people infected with Entamoeba histolytica have no symptoms at all. These asymptomatic carriers can still spread the parasite to others through poor hygiene practices. Symptoms may develop gradually over several weeks or appear suddenly.
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Causes and risk factors
Amebiasis spreads when you swallow the cysts of Entamoeba histolytica. This usually happens through drinking contaminated water or eating food washed in contaminated water. The parasite can also spread through direct contact with infected stool, often due to poor handwashing practices. Raw vegetables grown in contaminated soil and ice made from unsafe water are common sources of infection.
Your risk increases if you travel to areas with poor sanitation, live in crowded conditions with inadequate sewage systems, or have close contact with someone who has the infection. People who live in tropical and subtropical regions face higher exposure rates. Men who have sex with men and people with weakened immune systems also have increased risk. Children, older adults, and pregnant women may develop more severe cases if infected.
How it's diagnosed
Doctors diagnose amebiasis by testing stool samples for the presence of Entamoeba histolytica. The ova and parasite test looks for cysts or active parasites in your stool. You may need to provide multiple samples collected on different days because the parasite is not always present in every bowel movement. Lab technicians examine concentrated and permanently stained smears under a microscope to identify the parasite.
If you have symptoms of amebiasis, talk to your doctor about specialized testing. While Rite Aid offers comprehensive health monitoring, the specific stool tests needed to diagnose this parasitic infection require specialized laboratory analysis. Your doctor may also order blood tests to check for antibodies or imaging tests if they suspect the infection has spread beyond your intestines.
Treatment options
- Prescription antiparasitic medications to kill the parasite
- Antibiotics to eliminate the infection from intestinal tissue
- Increased fluid intake to prevent dehydration from diarrhea
- Rest and adequate nutrition during recovery
- Follow-up stool tests to confirm the parasite is gone
- Treatment of close contacts who may be infected
- Avoid preparing food for others until cleared by your doctor
- Strict handwashing to prevent spreading the infection
Frequently asked questions
You get amebiasis by swallowing the cysts of Entamoeba histolytica, usually through contaminated water or food. The parasite spreads through poor sanitation and hygiene practices. Direct contact with infected stool, such as changing diapers without proper handwashing, can also transmit the infection.
Amebiasis rarely goes away without treatment. Even if symptoms improve, the parasite can remain in your intestines and continue to spread to others. Untreated infections can become severe or spread to other organs like the liver. Prescription medications are needed to eliminate the parasite from your body.
Without treatment, amebiasis can last for months or even years. Symptoms may come and go during this time. With proper medication, most people feel better within a few days to a week. You need to complete the full course of treatment even if symptoms disappear early.
Yes, amebiasis is contagious through the fecal-oral route. Infected people shed parasite cysts in their stool, which can contaminate water, food, or surfaces. Good hygiene, especially handwashing after using the bathroom and before handling food, prevents transmission. People with amebiasis should avoid preparing food for others until cleared by a doctor.
Avoid raw or undercooked foods, especially in areas with poor sanitation. Do not eat raw vegetables or fruits unless you can peel them yourself. Avoid tap water, ice cubes, and beverages made with untreated water when traveling. Stick to bottled or boiled water and thoroughly cooked foods until your infection clears.
If left untreated, amebiasis can cause serious complications including liver abscesses, intestinal perforation, and spreading to other organs. These complications are rare but potentially life-threatening. With prompt treatment, most people recover fully with no lasting effects. Regular follow-up ensures the parasite has been eliminated.
Amebiasis is caused by a parasite rather than bacteria or viruses. The symptoms can last much longer than typical stomach bugs. Diarrhea from amebiasis often contains blood or mucus, which is less common with viral infections. Stool testing is needed to identify the specific cause and guide treatment.
People living in or traveling to areas with poor sanitation face the highest risk. This includes many tropical and subtropical countries. People with weakened immune systems, crowded living conditions, or inadequate access to clean water are also vulnerable. Healthcare workers and family members of infected individuals have increased exposure risk.
Drink only bottled, boiled, or treated water when traveling to high-risk areas. Avoid ice cubes and beverages made with tap water. Eat only thoroughly cooked foods and fruits you can peel yourself. Wash your hands frequently with soap and clean water, especially before eating and after using the bathroom.
Yes, follow-up stool testing is important to confirm the parasite has been eliminated. Your doctor will typically retest you a few weeks after completing treatment. Some people need a second course of medication if the first treatment does not clear the infection. Retesting also ensures you are no longer contagious to others.