Educational resource · Not a medical device · Infectious diseases review in progress · Does not replace clinical judgement

Streptococcus pyogenes — Group A Streptococcus (GAS)

Review by an infectious diseases specialist in progress · edited by a physician, AI-assisted writing · level of evidence computed from the source type · page as of 5 November 2026 · Methodology

Streptococcaceae · Gram-positive

Le SGA est responsable d'infections invasives potentiellement fulminantes : fasciite nécrosante, choc streptococcique toxique (TSS-like). La fasciite nécrosante relève d'une prise en charge chirurgicale immédiate — le diagnostic est clinique et, dans les recommandations, l'imagerie ne retarde pas la chirurgie. Une bactériémie à SGA s'accompagne d'une recherche active du foyer cutané/pharyngé et une évaluation des fascias.

Scope: dosing as described in the cited guidelines (French or international context, stated by the source), for adults with normal renal function unless stated on the line. No renal or hepatic, paediatric or pregnancy adjustment is provided systematically. These regimens have not been reviewed by any infectious-disease specialist to date.

Documented organ tropism

Organs where foci of Streptococcus pyogenes are described in the cited literature. The reported frequency is not an individual probability.

Organ	Tropism	Level of evidence	Sources	Spread route
Pharynx (angine streptococcique)	High tropism	Evidence B	3	direct
Skin (fasciite nécrosante)	High tropism	Evidence B	2	not recorded
Lung (pleuropneumonie)	Moderate tropism	Evidence C	1	not recorded
Heart / Endocardium	Rare tropism	Evidence B	1	not recorded
Meninges	Rare tropism	Evidence B	2	hematogenous
Pleura	Moderate tropism	Evidence B	1	contiguous

Described portals of entry

• Skin
• Pharynx

Spread routes recorded: 3 of 6 documented foci A focus without a route is not a focus without spread: the route is simply not recorded.

Associated syndromes

• Bacterial skin infections
• Septic arthritis and osteomyelitis

Sources

• HAS — Choix et durées d'antibiothérapie préconisées dans les infections bactériennes courantes (validée 2021, mise à jour décembre 2024) (2021) — https://www.has-sante.fr/jcms/p_3278764/fr/choix-et-durees-d-antibiotherapie-preconisees-dans-les-infections-bacteriennes-courantes
• SPILF — Antibiotherapie par voie generale en pratique courante : infections ORL et respiratoires basses de l'adulte et de l'enfant (2011) — https://www.infectiologie.com/
• Shulman ST et al. — Clinical Practice Guideline for the Diagnosis and Management of Group A Streptococcal Pharyngitis (CID) (2012) — doi:10.1093/cid/cis629
• IDSA — SSTI Practice Guidelines (2014) — doi:10.1093/cid/ciu296
• Stevens DL & Bryant — Necrotizing Fasciitis (NEJM) (2017) — doi:10.1056/NEJMra1600673
• Carapetis JR et al. — Global burden of GAS disease (Lancet Infect Dis) (2005) — doi:10.1016/S1473-3099(05)70267-X
• ESC Guidelines for the management of endocarditis (Delgado V et al.) (2023) — doi:10.1093/eurheartj/ehad193
• van de Beek D et al. — Community-acquired bacterial meningitis in adults (NEJM) (2004) — doi:10.1056/NEJMoa040845
• Thigpen MC et al. — Bacterial meningitis in adults (NEJM) (2011) — doi:10.1056/NEJMoa1005384

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