Cryptosporidium Enteritis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Cryptosporidium Enteritis?
A primary care doctor usually treats this infection from start to finish, ordering stool tests, prescribing medicine, and managing dehydration. Severe cases may be referred to an infectious disease specialist. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What it is
Cryptosporidium enteritis is an intestinal infection caused by a tiny parasite called Cryptosporidium. It spreads through contaminated water, food, or surfaces and causes watery diarrhea. Most healthy people recover on their own, but the infection can be serious for people with weak immune systems.
Symptoms
The main symptom is watery diarrhea that can come and go for days or weeks. Stomach cramps, nausea, vomiting, low fever, and weight loss are also common. Dehydration is the biggest concern, especially in young children and older adults. Symptoms usually start two to ten days after contact with the parasite.
Causes and who gets it
The parasite spreads when people swallow contaminated water or food. Swimming pools, lakes, and streams can carry it, and it survives normal chlorine levels. It can also pass from person to person or from animals. Risk is higher in childcare settings, among animal handlers and hikers, and in people with weakened immune systems.
How doctors diagnose it
Doctors start by asking about symptoms and recent activities, such as swimming or travel. The clearest way to confirm the infection is a stool test, though some labs use a more accurate molecular test. Blood tests can check whether the diarrhea has left you dehydrated.
Treatment
For most healthy people, the main treatment is drinking plenty of fluids, and the infection often clears within one to two weeks. Doctors sometimes prescribe nitazoxanide, a medicine approved to treat this parasite, along with medicines to control diarrhea. People with weakened immune systems may need stronger treatment.
When to see a doctor
Call a doctor if diarrhea lasts more than a few days, or if you cannot keep fluids down. Signs of dehydration, dark urine, dizziness, a dry mouth, or peeing much less than usual, need prompt attention. Seek care right away for a child with sunken eyes, no tears when crying, or unusual sleepiness.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance for visits. A concierge doctor usually charges more and often works alongside insurance, offering longer appointments and quicker follow-up. Either type can handle most cases of crypto directly and would refer severe cases to a specialist. You can search FindMyDirectDoctor.com to find this kind of doctor near you.
Common questions
Is cryptosporidium enteritis contagious?
Yes, it can spread from person to person. The parasite passes in stool, so good hand washing with soap and water is the best way to prevent spread. Hand sanitizer does not kill this parasite well, so soap and water matter.
How long does it last?
In healthy people, symptoms often last one to two weeks and then go away. Some people have symptoms that come and go for up to a month. People with weakened immune systems may stay sick much longer without treatment.
Can I swim with crypto?
No. People with diarrhea should stay out of pools and other shared water for at least two weeks after diarrhea ends. The parasite can keep passing in stool and survive in chlorinated water. This protects other swimmers from getting sick.
Does boiling water kill the parasite?
Yes. Boiling water for at least one minute kills Cryptosporidium. Standard chlorine treatment does not, which is why the parasite sometimes spreads in swimming pools.
Sources
- MedlinePlus - Cryptosporidium enteritis
- MedlinePlus Medical Encyclopedia - Cryptosporidium enteritis
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.
