FIG. 3.

Comparison of brain cyst loads in CBA/J mice infected i.p. with WT or Δsrs9 parasites. (A) Brain cyst counts in chronically infected CBA/J females after i.p. infection with 500 tachyzoites of the WT or Δsrs9 strain. Bars indicate average cyst counts of given groups, and asterisks indicate a statistically significant (P < 0.05) reduction between two groups. (B) Cyst diameter was measured in photographed hematoxylin- and eosin-stained brain sections from chronically infected CBA/J mice (6 weeks p.i.) and is presented in arbitrary units. The numbers of cysts assessed were 22 for the WT strain and 25 for the Δsrs9 strain.