Characterization of mouse virulence in representative isolates from China. (A) Summary of mouse virulence with different dosage of tachyzoites. (B) Proportion of surviving mice infected with different number of tachyzoites. (C) Elaboration of the percentage of survival mice inoculated with equal doses of different isolates in details. &, the corresponding haplogroup (Figure 1, k = 3). *, statistical significance of survival curves between Wh6 and other isolates (P < 0.01).