Bacillus pumilus is a Gram-positive, aerobic, spore-forming bacillus commonly found in soil.B. pumilus spores—with the exception of mutant strain ATCC 7061—generally show high resistance to environmental stresses, including UV light exposure, desiccation, and the presence of oxidizers such as hydrogen peroxide. Strains of B. pumilus found at the NASA Jet Propulsion Laboratory were found to be particularly resistant to hydrogen peroxide.A strain of B.