Streptococcus pyogenes M1UK Variant-Associated Sartorius Muscle Necrotizing Soft Tissue Infection: A Case Report and Literature Review
Abstract
Necrotizing soft tissue infections (NTSIs) represent a concept of necrotizing infections involving the skin, subcutaneous tissue, fascia, and muscle, and it is a potentially fatal disease. Early exploratory incision is strongly recommended for both the diagnosis and treatment of necrotizing soft tissue infections. Treatment of necrotizing soft tissue infections requires the administration of appropriate antimicrobial agents and adequate surgical debridement. The emergence of M1UK-lineage Streptococcus pyogenes (S. pyogenes) is recently reported in the UK, Canada, the USA, and the Netherlands. We report a Japanese case of sartorius muscle (SM) NTSI caused by M1UK-lineage S. pyogenes. A 34-year-old man developed redness and swelling of his right thigh anterior compartment with fever in October 2024. The closed and deep effusions by active exploratory incision/debridement on hospital days one to three yielded the presence of Gram-positive cocci, although two sets of blood cultures upon admission revealed no bacterial growth; its species identification results indicated S. pyogenes. Clinical and pathological diagnosis was streptococcal SM NTSI (without toxic shock syndrome (TSS)). Negative pressure wound therapy with instillation and dwelling (NPWTi-d) to promote his soft tissue cure was performed along with antimicrobial regimens. The patient recovered and received micrografting (carrier: artificial dermis made from collagen sponge and silicon film, Pelnac Gplus® (Gunze…
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