Abstract
IN 1941, one of us (A. J. H. T.) observed that about half the strains of Staphylococcus aureus isolated from the skin lesions of impetigo contagiosa had two properties not often seen in strains from other sources, namely, the ability (a) to inhibit the growth of corynebacteria on solid media, and (b) to produce zones of opacity on serum agar plates. In a recent investigation of impetigo in south-east Lancashire, it was found that 80 per cent of strains of Staph. aureus belonged to one phage type (Type 71), most members of which inhibited the growth of coryne-bacteria and were resistant to penicillin1. More than 95 per cent of the Type 71 strains also produced opacity zones on serum agar plates.
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References
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TOMLINSON, A., PARKER, M. Production of Opacity on Serum Agar Plates by Some Strains of Staphylococcus aureus . Nature 177, 895–896 (1956). https://doi.org/10.1038/177895b0
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DOI: https://doi.org/10.1038/177895b0
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