Table 1.

Presented dose of Ames spores.

	Presented dose
	(×106)	LD50
Total spores	44.28 ± 5.7	422 ± 54
Heat resistant spores	28.51 ± 3.3	271 ± 32
Heat sensitive spores	15.77 ± 3.5	150 ± 33
% Inhaled heat resistant spores (×100)	69.30 ± 2.7%
% Inhaled heat sensitive spores (×100)	30.70 ± 2.7%

All values are mean ± SEM (n = 60) and are data pooled from six separate exposure days where 10 rabbits were exposed each day.