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

Viridans streptococci — Viridans streptococci

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 29 October 2026 · Methodology

Streptococcaceae · Gram-positive

Le groupe viridans comprend S. mitis, S. oralis, S. sanguinis, S. gordonii, S. mutans (caries dentaires ++) — tous commensaux de la cavité orale. 1ère cause d'endocardite infectieuse sub-aiguë (SBE = endo de Lente/Osler) sur valvulopathie préexistante. Porte d'entrée = soins dentaires/gestes bucco-dentaires dans une part des cas (not verified). PROPHYLAXIE EI recommandée avant soins dentaires invasifs chez patient à risque élevé (prothèse valvulaire, EI antérieure, cardiopathie congénitale cyanogène) : amoxicilline PO 30-60 min avant. ETT/ETO recommandée devant toute bactériémie à streptocoque viridans.

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 Viridans streptococci are described in the cited literature. The reported frequency is not an individual probability.

Organ	Tropism	Level of evidence	Sources	Spread route
Heart / Endocardium	High tropism	Evidence B	3	not recorded
Central nervous system	Moderate tropism	Evidence B	2	hematogenous (derived from the card text)
Skin	Moderate tropism	Evidence B	1	hematogenous (derived from the card text)
Rein (glomérulonéphrite)	Moderate tropism	Evidence B	1	not recorded
Eye	Rare tropism	Evidence B	1	not recorded

Described portals of entry

• Pharynx
• Teeth / Oral cavity

Spread routes recorded: 2 of 5 documented foci (including 2 derived from the card text) A focus without a route is not a focus without spread: the route is simply not recorded.

Associated syndromes

• Infective endocarditis (IE)
• Brain abscess
• Prosthesis-related infection

Sources

• ESC Guidelines for the management of endocarditis (Delgado V et al.) (2023) — doi:10.1093/eurheartj/ehad193
• Baddour LM et al. — Infective Endocarditis in Adults: AHA Scientific Statement (Circulation) (2015) — doi:10.1161/CIR.0000000000000296
• Murdoch DR et al. — Clinical presentation, etiology and outcome of infective endocarditis (ICE-PCS) (2009) — doi:10.1001/archinternmed.2008.603

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