1. Cyst forms found in the feces .......... Go to: 3, 4, 5, & 6
2. Trophs (active forms) found in diarrhetic stool ........ Go to: 7, 8, & 9

3. Round to oval cyst (oocyst), many with a small cap (micropyle). Unsporulated: oocyst contains a single cell. Sporulated (Cultured): oocyst contains 4 sporocysts .......... Eimeria sp.
4. Small oval cyst containing 4 round nuclei at one end and dark lines (axostyle & median bodies) extending through the cyst. .......... Giardia sp.
5. A small round cyst with four nuclei, and sometimes containing dark chromatoid bodies within the cyst .......... Entamoeba histolytica
6. Very small cysts that require acid-fast staining to verify identification .......... Cryptosporidium sp.

7. A small tear-shaped or pear-shaped flagellate with 2 nuclei and an dark line (axostyle). (The organism slowly "wobbles" around the slide) .......... Giardia sp.
8. A small amoeba (variable shape) with 1 round "bull's-eye" nuclei and may contain vacuoles with host RBC's .......... Entamoeba histolytica
9. A wide variety of very active cilliates .......... Non-pathogenic Commensal Ciliates.