Roy et al identified risk factors associated with sporadic cryptosporidiosis in an immunocompetent patient. These can help identify patients with diarrhea who should be screened for cryptosporidia in the stool. The authors are from the Centers for Disease Control and Prevention and multiple state departments of health.


Patient selection: immunocompetent individual of any age with sporadic (non-epidemic) cryptosporidiosis


Risk factors associated with sporadic cryptosporidiosis:

(1) international travel

(2) contact with calves or cattle

(3) a significant chronic comorbid condition

(4) contact with a pediatric patient 2.001 to 11 years of age with diarrhea

(5) freshwater swimming


Factors reducing the risk of cryptosporidiosis:

(1) eating fresh vegetables (carrots, cucumbers, tomatoes)



• The fresh vegetables were protective in the United States. This effect might not extend to vegetables eaten in a developing country.


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