{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T08:36:29Z","timestamp":1782894989270,"version":"3.54.5"},"reference-count":157,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T00:00:00Z","timestamp":1782864000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Cell. Infect. Microbiol."],"abstract":"<jats:p>Necrotizing fasciitis, a prototypical form of necrotizing soft-tissue infection, is a rapidly progressive and life-threatening soft-tissue infection characterized by extensive fascial necrosis, systemic toxicity, tissue hypoperfusion, septic shock, and multiorgan dysfunction. Although early recognition, urgent surgical source control, appropriate antimicrobial therapy, toxin suppression when indicated, and organ support remain the foundations of management, the dynamic host-response states that link microbial virulence, local tissue injury, impaired pathogen clearance, perfusion failure, and secondary immune dysfunction have not been fully integrated into a dedicated immunopathological framework. This Review conceptualizes necrotizing fasciitis as a pathogen-shaped, compartmentalized host-response trajectory in which toxin- and pattern-recognition-driven hyperinflammation, tissue hypoperfusion, impaired pathogen clearance, and counter-regulatory immune dysfunction may overlap across local and systemic compartments. Using group A Streptococcus as an illustrative pathogen, we summarize how superantigens, cytotoxins, immune-evasion programs, complement activation, neutrophil-driven injury, endothelial dysfunction, immunothrombosis, and hypoperfused tissue niches can amplify local destruction while limiting effective immune clearance. We further compare immunopathological differences between group A Streptococcus-predominant monomicrobial disease and polymicrobial infection, emphasizing how pathogen context, host susceptibility, tissue perfusion, and timing of source control may shape divergent clinical trajectories. Clinically relevant approaches for longitudinal host-response assessment are reviewed, including circulating biomarkers, monocytic HLA-DR expression, lymphocyte indices, functional immune profiling, and perfusion-oriented evaluation. Evidence derived from human necrotizing fasciitis or necrotizing soft-tissue infection cohorts is distinguished from mechanistic evidence based on invasive group A Streptococcus models and related sepsis literature. Host-directed immunomodulatory strategies remain largely investigational and should be interpreted through phenotype selection, timing, and evidence-boundary considerations. This host-response trajectory framework may help connect infection biology with immune monitoring, source-control reassessment, antimicrobial therapy, secondary infection surveillance, and phase-informed care. Prospective biomarker-stratified studies are needed to determine whether dynamic immune and perfusion phenotyping can improve survival, limb salvage, wound-bed readiness, reconstructive success, and long-term functional recovery.<\/jats:p>","DOI":"10.3389\/fcimb.2026.1874595","type":"journal-article","created":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T06:56:50Z","timestamp":1782889010000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Host-response trajectories in necrotizing fasciitis: host-pathogen interactions, immune evasion, and immunoparalysis"],"prefix":"10.3389","volume":"16","author":[{"given":"Shuo","family":"Yang","sequence":"first","affiliation":[{"name":"Department of Orthopedic Surgery, The Third Hospital of Hebei Medical University","place":["Shijiazhuang, Hebei, China"]},{"name":"Orthopaedic Research Institute of Hebei Province","place":["Shijiazhuang, Hebei, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin","family":"Jin","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, The Third Hospital of Hebei Medical University","place":["Shijiazhuang, Hebei, China"]},{"name":"Orthopaedic Research Institute of Hebei Province","place":["Shijiazhuang, Hebei, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin","family":"Liu","sequence":"additional","affiliation":[{"name":"Orthopaedic Research Institute of Hebei Province","place":["Shijiazhuang, Hebei, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ling","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Oncology, The Third Hospital of Hebei Medical University","place":["Shijiazhuang, Hebei, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiyong","family":"Hou","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, The Third Hospital of Hebei Medical University","place":["Shijiazhuang, Hebei, China"]},{"name":"Orthopaedic Research Institute of Hebei Province","place":["Shijiazhuang, Hebei, China"]},{"name":"National Health Commission (NHC) Key Laboratory of Intelligent Orthopedic Equipment (The Third Hospital of Hebei Medical University)","place":["Shijiazhuang, Hebei, China"]},{"name":"Engineering Research Center of Orthopedic Minimally Invasive Intelligent Equipment, China Ministry of Education","place":["Shijiazhuang, Hebei, China"]},{"name":"Key Laboratory of Biomechanics of Hebei Province","place":["Shijiazhuang, Hebei, China"]},{"name":"Key Laboratory of Precise Assessment, Diagnosis, and Treatment of Soft Tissue Injury of Hebei Province","place":["Shijiazhuang, Hebei, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,7,1]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"705","DOI":"10.1086\/511638","article-title":"Necrotizing soft-tissue infection: diagnosis and management","volume":"44","author":"Anaya","year":"2007","journal-title":"Clin. 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