Abstract
Summary
High concentrations of potassium and sodium phosphates incorporated in the media markedly increased the number of strains of alpha hemolytic streptococci which produced L-type growth when exposed to penicillin. High concentrations of NaCl produced this effect only slightly. Using the phosphate media, strains of alpha-hemolytic streptococci which produced L forms were found in about one-fourth of the throat cultures examined. One unusual strain of alpha-hemolytic streptococcus produced L forms spontaneously without exposure to penicillin.
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