Table 2.

Results from three aerosol exposures with ultra-low doses of MTB^*

Aerosol Exposure Group	Starting inoculum OD × 10-4	Pre-nebulizer (CFU/mL) × 104	Post-nebulizer (CFU/mL) × 104	Presented Dose (CFU/ mouse)	Time of necropsy (weeks)	Infected/Total Mice (%)
E	2.5	3.05	0.10	1.1	5	10/28 (36%)
F	0.8	0.35	0.30	1.6	3	5/14 (36%)
G	10	33	10.6	11.0	4	19/20 (95%)

^*Exposures were conducted as described in Table 1. The proportion of mice infected was based on lung cultures at 3-5 weeks after exposure. CFU data from these exposures are shown in Figure 2.