Answer: Entamoeba polecki cysts and trophozoites.
As mentioned by several of my viewers, this organism is characterized by its abundance of chromatoid bodies in the cyst form, moderate size, Entamoeba-type nucleus with peripheral rim of chromatin and eccentric karyosome (the latter can be large and diffuse as in this case), and single nucleus in the cyst form. Some of you mentioned that the chromatoid bodies resembled RBCs; however, they are more numerous than would be expected for RBCs, and more elongate and irregular in size.
Here are some of the characteristic features of the cyst forms:
Thank you for writing in!