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Cryptosporidiosis is a diarrheal infection caused by the parasite Cryptosporidium. The parasite is transmitted after drinking or swallowing contaminated food or water, including water swallowed while swimming. Because the parasite is protected by an outer shell that allows it to survive for long periods of time outside the body, it is very resistant to chlorine disinfection.
Cryptosporidium is prevalent throughout the world. Travelers to developing countries who visit rural areas, hike or trek in backcountry areas, or frequently eat or drink in areas where sanitation is poor are at greatest risk of contracting the disease. Outbreaks of cryptosporidiosis have also occurred in the United States when water supplies or swimming pools become contaminated.
The disease is spread by accidentally swallowing anything that has come into contact with the feces of a person or animal with the infection. This includes:
While cryptosporidiosis is normally not a serious disease, for persons with a severely weakened immune system, it can lead to a serious or life-threatening illness. This includes persons with:
The following are the most common symptoms of cryptosporidiosis. However, each individual may experience symptoms differently. Symptoms may include:
Some persons do not present any symptoms. If symptoms are present, they often last about two weeks and then you may feel better. However, you continue to pass the parasite in your stool for up to two months, and during this period you may spread the infection to others.
The best ways to prevent cryptosporidiosis are through good personal hygiene, avoiding unsafe water sources, and avoiding unboiled water and uncooked foods in areas known to have poor sanitation.
Diagnosis of cryptosporidiosis is made through examination of stool samples to determine if they are infected. Because tests for this disease are not routinely done in laboratories, special testing for the parasite must be done.
There is no completely effective treatment for cryptosporidiosis, and persons with a healthy immune system generally recover on their own. Persons who are in poor health or those persons with a weakened immune system risk a more serious infection. Fluid replacement is important (as with any diarrheal disease) and some medications may help to alleviate diarrhea symptoms. Specific treatment for cryptosporidiosis will be determined by your physician based on: