For maximum effect, these spores need to be delivered in an aerosol so that they are inhaled. The smaller the spores, the more dangerous the weapon, because they penetrate more deeply into a person's lungs.
Once in the body, spores may germinate at the site of entry or may be engulfed by macrophages and carried to lymph nodes. There they germinate, multiply and enter the blood stream.
The bacterium has...