# What is Cryptosporidiosis (Cryptosporidium)? Canonical page: https://clinicsjo.com/en/faq/ma-huwa-daa-khafiyat-alabwag-alkryptwspwrydywm-walw-qaya-minhu Language: en Category: infectious Publisher: ClinicsJo Published: 2026-09-13T08:09:51.351Z Content updated: 2026-09-13T08:09:51.351Z Translation (ar): https://clinicsjo.com/ar/faq/ma-huwa-daa-khafiyat-alabwag-alkryptwspwrydywm-walw-qaya-minhu Cryptosporidiosis, also known as "Crypto," is an infectious disease caused by a microscopic parasite called Cryptosporidium. This parasite lives in soil, food, water, or on surfaces contaminated with feces from infected humans or animals. This infection primarily causes watery diarrhea and can affect people worldwide [\[1\]](). ## How is cryptosporidiosis transmitted? Cryptosporidium infection is transmitted when a person swallows the parasite found in food, drinking water, or water in which they are swimming. Infection can also be transmitted by touching a contaminated surface and then touching the eyes, mouth, or nose. Additionally, the parasite can be spread through sexual contact. The parasite is found in the feces of infected people and animals, making it a source of infection [\[1\]](). Groups at higher risk for infection include children and workers in childcare centers, older adults (aged 75 and older), people caring for patients with Cryptosporidium, international travelers, and hikers who drink untreated water. People who swallow water from contaminated sources, including swimmers and individuals who have contact with infected animals (such as cattle and sheep), are also at increased risk [\[1\]](). ## What are the main symptoms of cryptosporidiosis? The most common symptom of cryptosporidiosis is watery diarrhea. Other symptoms may include dehydration, weight loss, stomach cramps or pain, fever, nausea, and vomiting. Symptoms typically begin 2 to 10 days after exposure to the parasite and last for one to two weeks in people with a healthy immune system. In some cases, symptoms may persist longer or appear and disappear for up to 30 days [\[1\]](). For people with weakened immune systems, such as those with HIV, cancer, or those taking immunosuppressive medications (e.g., chemotherapy or post-transplant drugs), the infection may progress to a chronic and serious illness. Anyone experiencing watery diarrhea that lasts more than a few days, especially if they have a compromised immune system, should contact a healthcare provider [\[1\]](). ## Can home water filters protect against cryptosporidiosis? Some home water filters can help protect against cryptosporidiosis, but not all of them. Many common home water filters, such as those found in pitchers or refrigerators, are designed to improve water taste or remove heavy metals like lead and are not designed to remove germs [\[2\]](). To remove the Cryptosporidium parasite, look for water filters with an absolute pore size of 1 micron or smaller. Filters that are NSF-certified under standards 53 or 58 for cyst reduction or removal, or those utilizing microfiltration, ultrafiltration, nanofiltration, or reverse osmosis technologies, are effective in removing parasites like Cryptosporidium [\[2\]](). It is always important to check the product label to ensure its ability to remove parasites. If you have a weakened immune system, it is recommended to consult a healthcare provider and a water treatment specialist regarding the best water treatment system for you [\[2\]](). ## What are the most important methods for preventing cryptosporidiosis? The most important methods for preventing cryptosporidiosis include: - **Thorough handwashing:** Wash your hands with soap and water regularly, especially after using the toilet, changing diapers, touching animals, and before eating or preparing food. Alcohol-based hand sanitizers are not effective against Cryptosporidium [\[1\]](). - **Drinking safe water:** Only drink water known to be safe. Ensure milk and apple cider are pasteurized [\[1\]](). - **Avoiding swallowing swimming water:** Do not swallow water from swimming pools, lakes, or rivers. Never swim if you have diarrhea [\[1\]](). - **Personal hygiene while traveling:** Avoid eating uncooked foods when traveling to countries where food supplies may be unsafe [\[1\]](). - **Practicing safe sex:** Use a condom or dental dam every time you have sex to prevent Cryptosporidium and other sexually transmitted infections [\[1\]](). For more information about this infection and prevention methods, you can visit [Cryptosporidiosis: Waterborne Infection and Prevention (Arabic)](). ## Medical references - [Cryptosporidiosis]() - [About Choosing Home Water Filters]() - [About Crypto Infections]() General health education; not a substitute for individualized clinical assessment. Citation URL: https://clinicsjo.com/en/faq/ma-huwa-daa-khafiyat-alabwag-alkryptwspwrydywm-walw-qaya-minhu#answer