Abstract
The capability of the streptomyces phage WSP-3 to form plaques on Streptomyces griseus strains WAc-86 and WAc-104 and S. olivaceus strain WAc-11 depended upon the prior host. Modification of the relative plaque-forming capacity was hereditary, discounting non-hereditary host-induced modification. Although each of the hosts was 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 probably resulted from selection of mutants.

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