These results strongly imply the presence in some anthrax bacilli of a latent genetic potential for motility. Such mutant cultures do not differ significantly from their parent cultures of B. anthracis except with respect to motility. Difficulties have been encountered in the repetition of the experiments on the induction of motility in B. anthracis by means of bacteriophage lysates. This has been discussed by Sterne and Proom (1957). This paper attempts to define the present status of laboratory tests for the diagnosis of anthrax by reporting the writers' experience based on the examination of more than 250 499

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