SUMMARY: The relatedness between strains of bacilli in the Bacillus cereus group has been studied by DNA/DNA competition using the memberane filter technique. Strains of B. cereus, B. thuringiensis and of B. anthracis form a closely related group, in which B. thuringiensis can be distinguished from B. cereus. Bacillus megaterium includes a wider range of strains, some of which are closely related to B. cereus, B. thruringiensis and B. anthracis.
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Somerville et al. (1972) studied this question.