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Action of Bacteriophage on Mixed Strain Starter Cultures. II. Relation to Acid Production of the Proportion of Resistant Bacteria

Division of Dairy Industry, University of California, Davis

ABSTRACT

Plate counts and titratable acidity values were subnormal following the action of bacteriophage on a mixture of one susceptible and one resistant strain of bacteria. When the susceptible strain was used to make up 50 per cent of the total bacterial inoculum, plate counts and titratable acidity values were only slightly below normal. Differences in plate counts were negligible 2 to 3 hr. after the bacteriophage had caused lysis of the susceptible strain. Use of the susceptible strain as 75 per cent of the mixture permitted bacteriophage to cause greater deviations in plate counts and in titratable acidity, but even in mixtures which contained susceptible bacteria as 90 and 95 per cent of the total bacterial inoculum, the production of acid was appreciable and greater than that in cultures which had been inoculated with only resistant bacteria in amounts equal to those used in mixtures.