T. gondii tachyzoites ME49 (clone B7–21), ME49-GFP-Luc1 and Pru-Δhxgprt-tdTomato (Pru-tdTomato)2 were propagated in confluent human foreskin fibroblasts (HFF1) in DMEM medium containing high glucose supplemented with 100 U ml−1 penicillin, 100 mg ml−1 streptomycin and 2 % fetal bovine serum.