Cryptosporidiosis is an infection in the intestines. It is a minor problem for most people. But, it can be life-threatening for young children, the elderly, and those with weak immune systems.

The Intestines

Causes

A certain parasite causes cryptosporidiosis. It often enters the body through food or drink that has the parasite. It can also be passed from contaminated water, soil, or stool (poop). Common ways are:

Water from lakes, streams, hot tubs, swimming pools, or water parks
Ice cubes
A baby's dirty diapers
Touching animals, cleaning cages, or going to barns or petting zoos
Eating food grown in soil
Eating or drinking unpasteurized dairy products or apple cider

Risk Factors

The infection is more common in children 2 years of age or less. Other things that raise the risk are:

Being or working in day care or a group setting
Conditions that weaken the immune system such as cancer, HIV, or an organ transplant
Swimming in or drinking contaminated water
People who have oral to anal contact during sex

Symptoms

Most people do not have symptoms. If symptoms happen, they may cause:

Watery stools (poop)
Belly cramps
Nausea or vomiting
Slight fever
Weakness
Loss of hunger
Weight loss

These symptoms can lead to dehydration.

Diagnosis

The doctor will ask about symptoms and past health. A physical exam and stool tests may be done.

Treatment

In most people, the infection goes away on its own.

Treatment may be needed for those with severe and longer lasting infection. It may involve:

IV fluids
Medicine to control diarrhea
Antiparasitic medicine

Prevention

To reduce the risk of cryptosporidiosis:

Wash hands often, mainly:

After using the toilet and changing a diaper.
Before handling or eating food.
After being with animals, people who are sick, or being in soil.

In general:

Use safe water. Also, wash fruits and vegetables in safe water.
Try not to swallow while playing or swimming water.
Do not eat or drink unpasteurized dairy products or apple cider.
Use barriers when having oral sex.

RESOURCES:

Centers for Disease Control and Prevention
https://www.cdc.gov

IDSA—Infectious Diseases Society of America
http://www.idsociety.org

CANADIAN RESOURCES:

Canadian Public Health Association
https://www.cpha.ca

Health Canada
https://www.canada.ca

References:

Cryptosporidiosis. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/cryptosporidiosis. Accessed August 25, 2021.

Cryptosporidiosis. New York Department of Health website. Available at: https://www.health.ny.gov/diseases/communicable/cryptosporidiosis/fact_sheet.htm. Accessed August 25, 2021.

Desai AN. Cryptosporidiosis. JAMA. 2020;323(3):288.

Foodborne illnesses. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/foodborne-illnesses. Accessed August 25, 2021.

Parasites—cryptosporidium (also known as crypto). Centers for Disease Control and Prevention website. Available at: https://www.cdc.gov/parasites/crypto/. Accessed August 25, 2021.

Last reviewed July 2021 by EBSCO Medical Review Board David L. Horn, MD, FACP
Last Updated: 8/25/2021

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