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Resistance Relationships in Mycobacterium smegmatis ATCC 607 to Phages Sensitive or Resistant to both Chloroform and Streptomycin Sulphate

Center for Disease Control Public Health Service U.S. Department of Health, Education and Welfare, Atlanta Georgia 30033, U.S.A.

Four of eight mycobacteriophages did not form plaques after they were exposed to chloroform. Phages sensitive to chloroform did not produce plaques when plated on media containing 1000 µg/ml of streptomycin sulphate. The same concentration of dihydrostreptomycin sulphate did not interfere with plaque formation. Mutants of Mycobacterium smegmatis resistant to each of the eight phages were isolated. Sensitivity or resistance to chloroform and streptomycin sulphate and phage resistant bacterial mutants may provide a basis for classifying the mycobacteriophages.

Received 25 July 1977; accepted 6 January 1978.