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(1) Four batches of 60 mice have been injected with comparable doses ofB. aertrycke(mutton), taken from broth or agar cultures in different phases of reproductive activity. (2) The mortality and the average survival time of the mice after injection varied so little amongst the different groups as to justify the conclusion that no difference in the virulence of this organism is detectable during the first week of growth.
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G. S. Wilson (1926) studied this question.
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