ootsüst - alglooma (nt. toksoplasma või sääsestaadiumis oleva malaariaplasmoodiumi) puhkestaadium, munatsüst, millest moodustub sprosoiit
oöcyst - In certain Protozoa, the cyst formed around two conjugating gametes; in Sporozoa, the passive phase into which the active vermiform phase changes in the host.
For coccidiostats and other medicinal substances, importance should primarily be attached to evidence of the specific effects and particularly prophylactic properties (e.g. morbidity, oocyst count and lesion score).