Cryptosporidium Parvum

What is Cryptosporidium parvum?

Cryptosporidiosis is a disease caused by the one-celled animal Cryptosporidium parvum.

Cryptosporidium parvum infection symptoms include watery diarrhea, stomach cramps, an upset stomach or a slight fever. The first symptoms may appear two to ten days after a person becomes infected. In a healthy person with a normal immune system, symptoms normally last about two weeks, although individuals may recover then get worse again.

Some people may carry Cryptosporidium parvum and not get sick, but pass the disease to others. Children are especially susceptible. Cryptosporidiosis can be life-threatening among persons with weakened immune systems.

More Information on Cryptosporidium parvum:

• Foodborne Pathogenic Microorganisms and Natural Toxins 1992 (Bad Bug Book) 

• The Centers for Disease Control and Prevention

Food Safety Project Director
Catherine H. Strohbehn, PhD, RD, CFSP
HRIM Extension Specialist
Adjunct Associate Professor
Hotel, Restaurant, and Institution Management
Iowa State University

Consumer and Processing Food Safety and Science
Sam Beattie, PhD
Food Safety Extension Specialist
Department of Food Science and Human Nutrition
Iowa State University Extension

• Article History
• Revision Date: 8/18/2009