Out of eight donkeys examined, two had gametogonic and sporogonic stag
es of Klossiella equi in their kidneys. Gametogonic stages included mi
crogametocytes and macrogametocytes, some of them in syzygy. They were
found in enlarged parasitophorous vacuoles situated in epithelial cel
ls of the renal tubules. Sporonts were seen in the epithelial cells pr
otruding into the tubular lumen while sporoblasts, sporocysts and spor
ozoites were found freely in the tubular lumen. Entire sporocysts were
rarely encountered but sporozoites liberated from the ruptured sporoc
ysts could be seen. No inflammatory reaction could be attributed to th
e presence of these parasites.