Purification procedures of Toxoplasma gondii suspensions are described. These methods were designed for the elimination of leucocytes or TG 180 cells. We have been using either gradient centrifugation in Ficoll or gel filtration. In the first case, only leucocytes are eliminated (95% of the initial content). On the other hand, gel filtration allowed the elimination of TG 180 cells. The yield (67% to 98%) depends on the chosen gel (Ultrogel AcA 202 or Sephadex G25 fine), and on the amount of TG 180 cells present before filtration.