Parasitic protozoa causing diarrhea. See Cryptosporidiosis.Encyclopedia Entry for Cryptosporidium :Cryptosporidium enteritis. Cryptosporidium has recently been recognized as a cause of diarrhea worldwide in all age groups. It has a greater effect on people with a weakened immune system, including: People who take medicines to suppress their immune system People with HIV/AIDS Transplant recipients In these groups, this infection is not just bothersome, but can lead to severe and life-threatening loss of muscle and body mass (wasting) and malnutrition. The major risk factor is drinking water that is contaminated with feces (stool). People at higher risk include: Animal handlers People who are in close contact with infected people Young children Outbreaks have been linked to: Drinking from contaminated public water supplies Drinking unpasteurized cider Swimming in contaminated pools and lakes Some outbreaks have been very large.Symptoms of infection include: Abdominal cramping Diarrhea, which is often watery, large-volume, and occurs many times a day General sick feeling ( malaise ) Malnutrition and weight loss (in severe cases) Nausea.These tests may be done: Antibody test to see if cryptosporidium is in the stool Intestinal biopsy (rare) Stool exam with special techniques (AFB staining) Stool exam using a microscope to look for the parasites and their eggs.There are several treatments for cryptosporidium enteritis. Drugs such as nitazoxanide have been used in children and adults. Other drugs that are sometimes used include: Atovaquone Paromomycin These drugs often help only for a little while. It is common for the infection to return. The best approach is to improve immune function in people who have a weakened immune system. In people with HIV/AIDS, this can be done by using highly active antiviral therapy. Using this type of treatment can lead to a complete remission of cryptosporidium enteritis.In healthy people, the infection will clear up, but it can last up to a month. In people with a weakened immune system , long-term diarrhea may cause weight loss and malnutrition.These complications can occur: Inflammation of a bile duct Inflammation of the gallbladder Inflammation of the liver (hepatitis) Malabsorption (not enough nutrients being absorbed from the intestinal tract) Inflammation of the pancreas (pancreatitis) Loss of body mass that causes extreme thinness and weakness (wasting syndrome).Contact your health care provider if you develop watery diarrhea that does not go away within a few days, especially if you have a weakened immune system.Proper sanitation and hygiene, including handwashing, are important measures for preventing this illness. Certain water filters can also reduce risk by filtering out the cryptosporidium eggs. However, the pores of the filter must be smaller than 1 micron to be effective. If you have a weakened immune system, ask your provider if you need to boil your water.Cryptosporidiosis.Cryptosporidium, organism Cryptosporidium, organism Digestive system organs Digestive system organs.Huston CD. Intestinal protozoa.