Figure 2.
Virulence of complemented cps1-1 strains. Virulence of strains was determined by intraperitoneal injection of C57BL/6 mice with 2 × 106 tachyzoites of strain cps1-1 (circles), or 2 × 103 tachyzoites of a cloned isolate of cps-1 complemented with Pc 4 (tiangles), mutant A348 (squares), or mutant 873-910 (diamonds). Groups of 4 mice were infected intraperitoneally with freshly isolated tachyzoites. Data from two experiments is shown as % survival of animals compared to cps1-1 infection.