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We recovered a non-beta-hemolytic Streptococcus pyogenes strain from a severe soft tissue infection. In this isolate, we detected a premature stop codon within the sagC gene of the streptolysin S (SLS) biosynthetic operon. Reintroduction of full-length sagC gene on a plasmid vector restored the beta-hemolytic phenotype to our clinical isolate, indicating that the point mutation in sagC accounted for loss of hemolytic activity. To the best of our knowledge, this is the first report to demonstrate that a severe soft tissue infection can be caused by a non-beta-hemolytic S. pyogenes strain lacking a functional SagC.

Severe Soft Tissue Infection Caused by a Non-Beta-Hemolytic Streptococcus pyogenes Strain Harboring a Premature Stop Mutation in the sagC Gene