The life Cycle of E.labbeana and E.columbarum.

(The Causative Agent of Coccidiosis)




The oocysts complete development and become infective (sporulate) outside of the host’s body


The infective oocyst are ingested by a host





The oocyst “excysts” in the small intestine, and sporozoites infect the cells lining the small intestine


Oocysts are passed in the feces of the infected host


The parasite reproduces asexually in the cells of the small intestine producing merozoites.  The merozoites infect more intestinal cells.


After several generations of asexual reproduction, oocysts are produced



Asexual reproduction (schizongony or merogony) is self-limiting and ceases after several generations.

Oocysts are produced only as long as schizogony continues.