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SUMMARYThe relative virulence of the streptomyces phage WSP-3 for Streptomyces griseus strains WAc-86 and WAc-104 and S. olivaceus strain WAc-11 depended upon the prior host. Modification of virulence pattern was hereditary, discounting non-hereditary host-induced modification. Although the hosts were lysogenic, population equilibria among different temperate phages were not involved in the shifts of relative virulence produced by the preceding host. Hereditary modification of the virulence-pattern resulted from selection of mutants of different virulence.
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S. G. Bradley (1959) studied this question.
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