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A genus of protozoa parasites belonging to the order Coccidia and the phylum Apicomplexa. Cyclospora cayetanensis species are pathogenic to humans causing disease symptoms similar to those caused by Cryptosporidium, except cyclosporiasis does appear responsive to treatment with medicine such as trimethoprim-sulfamethoxazole (TMP-SMX). Cyclospora reproduce with environmentally resistant oocysts (about 8-10 micrometers in size) that can be carried viably in unfiltered water supplies. See Also: Cryptosporidium Cyst Oocyst Cryptosporidium Cyst Cryptosporidium