They excrete cysts in the environment, able to infect many other animals, and humans can become infected either by ingesting the cysts (by direct contact with cats or through food or water contaminated by cat faeces), or by eating poorly cooked meat containing cysts, especially pork and mutton.
Te v okolje izločajo ciste, ki lahko okužijo številne druge živali, ljudje pa se lahko okužijo z zaužitjem cist (ob neposrednem stiku z mačkami oz. s hrano ali vodo, ki je okužena z iztrebki mačk) ali z zaužitjem nezadostno kuhanega mesa, ki vsebuje ciste, zlasti svinjine in ovčetine.