Cryptosporidium parvum (image) McGill University Health Centre Caption This is an immunofluorescence image of Cryptosporidium parvum oocysts. Credit Wikimedia Commons Usage Restrictions This image (or other media) is a work of an Environmental Protection Agency employee, taken or made as part of that person's official duties. As works of the US federal government, all EPA images are in the public domain. http://en.wikipedia.org/wiki/File:Cryptosporidium_parvum_01.jpg Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.