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-The Protozoa presents a sexual phase in cat and an asexual phase in many mammmals and even birds - The final result of sexual process ocurring inside intestinal cells is a cystic stage coming from zygote: the oocyst. -Young cats are prone to infection, which usually shows only mild symptoms. - Once cat develops immunity, reinfection is unlikely or yielding a very low oocyst production - Cats can act also as an intermediate host (but in this sense is an unlikely source of infection).