Keywords: Cryptosporidium muris.jpg Nomarski interference contrast photomicrographs of Cryptosporidium muris from the feces of an HIV-positive human Scale bars 5 micrometer Source CDC http //www cdc gov/ncidod/eid/vol9no9/03-0047-G1 htm PD-USGov Cryptosporidium Differential interference contrast microscopic images |