TABLE 3.

Bacterial loads determined in the spleens of guinea pigs infected intramuscularly with either wild-type Ames or ΔpurH spores

Challenge strain	Challenge dose	Bacterial load (CFU/g)	No. of animals	% Recovery relative to challenge dose	P
Ames wta	1 × 103	3.3 × 109	3	3.3 × 108	0.006
ΔpurH strain	1 × 107	4.20 × 105	5	0.42

^awt, wild type.