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SUMMARY
Strains of Streptomyces selected for resistance to one bacteriophage frequently became resistant to other bacteriophages. Twelve bacteriophages of different origin were arranged into allied groups on the basis of cross resistance patterns. In one instance, resistance to one bacteriophage conferred immunity to all other phages tested. Conversely selection for resistance to one bacteriophage rarely resulted in sensitivity to a second phage. Lysogenization was not responsible for the bacteriophage resistance.