Table 2.

Seroconversion rates after oral infection with in vivo bradyzoite tissue cysts

Strain	Cyst dosea	No. seropositive/totalb	% Seropositivec
Parental	100	5/15	33
	250	4/6	67
Δbpk1	100	1/13	8
	250	0/6	0
Complemented	100	2/7	29
	250	3/7	43

^aCyst dose indicates the number of cysts fed to each mouse. Cysts were enumerated in brain mash by staining with the DBA lectin and counting as described in Materials and Methods.

^bNumber of seropositive mice as determined by Western blotting as described in Materials and Methods shown as a ratio over the total number of mice fed. Pooled data from 6 experiments are shown for the parental and complemented strains. Pooled data from 3 experiments are shown for the complemented strain.

^cPercentage of mice that seroconverted compared to the total number of mice fed.