The active and motile form, called trophozoites, are the stage which lives in the intestines of an affected mammal. (lbah.com)
Once they enter the digestive tract, they turn into trophozoite which interfere with digestive system function Source: Cornell University College of Veterinary Medicine (cat-health-guide.org)
It attaches to the cells of the intestine with its adhesive disc and rapidly divides to produce a whole population of trophozoites. (priory.com)