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Microbiological and Chemical Exposure Assessment

Cryptosporidium and Giardia

Cryptosporidium and Giardia image

Photo Credit: H.D.A. Lindquist, U.S. EPA

These images are in the public domain and are thus free of any copyright restrictions. For public domain images, permission is not required for their use but we do ask that you credit the EPA and the contributors (found in the Photo Credit line) whenever an image is used in any publicly distributed media.

Cryptosporidium parvum oocysts and Giardia lamblia (intestinalis) cysts imaged together for purposes of comparison. In the photomicrograph, the C. parvum oocysts are distinguished from neighboring G. lamblia cysts by their smaller size. Bar = 10 microns.

Source: C. parvum - Calf stool; G. lamblia - Gerbil stool.

Method: Confocal Microscopy

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