Balantidiasis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Balantidiasis?
A primary care doctor can usually diagnose and treat balantidiasis. If the infection is severe or does not improve, you may be sent to an infectious disease specialist. A gastroenterologist may be involved if a camera exam of the colon is needed.
What it is
Balantidiasis is an infection caused by a tiny one-celled parasite called Balantidium coli. The parasite lives in the large intestine, the last part of the gut. Most people pick it up from food or water that has touched pig or human waste. Some people feel fine, while others get stomach cramps and diarrhea.
Symptoms
Many people who carry the parasite never feel sick. When symptoms do appear, they often include belly pain, diarrhea, nausea, and tiredness. In serious cases, the diarrhea may contain blood, and fluid loss can cause dehydration.
Causes and who gets it
Pigs are the main carriers, and the parasite passes in their stool. People swallow the parasite by drinking dirty water, eating food washed in dirty water, or touching their mouth with unclean hands. The infection is rare in the United States but more common where pigs live close to people and clean water is scarce. Farmers, slaughterhouse workers, and people who raise pigs have a higher chance of exposure.
How doctors diagnose it
A doctor will ask about your symptoms, travel history, and any contact with pigs. The most common test is a stool test, where a lab looks at a sample under a microscope. Sometimes more than one sample is needed because the parasite does not show up every time.
Treatment
Balantidiasis is treated with prescription medicines that kill the parasite, such as tetracycline or metronidazole. Your doctor will choose the medicine and length of treatment based on your health and how bad the infection is. Drinking plenty of fluids matters, especially if diarrhea has caused fluid loss. Most people recover well with treatment.
When to see a doctor
Talk to a doctor if you have diarrhea that lasts more than a few days, blood in your stool, strong belly pain, or signs of dehydration such as thirst, dizziness, or very little urine. Getting checked early can keep the infection from getting worse.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Both can order stool tests, prescribe medicine, and follow up closely to make sure you are recovering. If the infection is severe or keeps coming back, they will refer you to a specialist.
Common questions
Is balantidiasis contagious from person to person?
It can spread between people, but this is not common. Good hand washing after using the bathroom protects others. Most cases come from pigs or dirty water.
Can balantidiasis go away on its own?
Some people carry the parasite without symptoms and may not need treatment. People with symptoms usually need prescription medicine to clear the infection.
How can I prevent balantidiasis?
Drink clean, treated water and wash fruits and vegetables well. Wash your hands with soap after using the bathroom, after handling pigs, and before eating.
Sources
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
