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J Clin Microbiol. 1978 February; 7(2): 153-157

Hemolytic mutants of group A Streptococcus pyogenes.

W Owens, F Henley and B D Barridge

ABSTRACT

Hemolytic mutants of Lancefield strain SS-95 and ATCC 19615 Streptococcus pyogenes were produced by treatment with N-methyl-N'-nitro-N-nitrosoguanidine. These mutants contained the same levels of streptolysin O, nicotinamide adenine dinucleotidase, deoxyribonuclease, and hyaluronidase. The mutants were deficient in streptolysin S, as was the naturally occurring nonhemolytic Lowry strain. The mutants retained their pathogenicity for mice and, when reisolated from the dead animals, produced the mutant hemolytic pattern.

J Clin Microbiol. 1978 February; 7(2): 153-157




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