An unusual mesophilic bacillus was isolated from soil, and a cleaned spore preparation of this organism showed extreme resistance to dry heat (D = 139 h, D = 54 h, D = 24 h, D = 13 h, D = 8 h, D = 2.5 h; where D = time at temperature effecting 90% reduction in viable count); and relative sensitivity to moist heat (D = 61 min). The biochemical tests, exterior and interior spore morphology, and growth characteristics of this organism do not fit those of any of the presently described species of bacteria. Consequently, we regard this organism as belonging to a new species, for which we propose the name The type strain of this species has been deposited in the American Type Culture Collection as ATCC 27380.


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