1. Quelle caractéristique morphologique distingue principalement les staphylocoques des streptocoques ?
2. Quel est le principal rôle de la capsule chez les bactéries à Gram positif, comme le pneumocoque, selon la fiche de révision?
3. Quel est le principal mécanisme de virulence associé à S. pyogenes (groupe A) ?
Streptocoques alpha-hémolytiques
Commensaux, infections buccales, endocardites
Cocci Gram positif — forme?
Sphériques, en chaînettes ou amas.
Streptocoques bêta-hémolytiques
Groupes A et B, infections graves
Capsule — rôle?
Virulence, évite la phagocytose.
S. pyogenes — pathologie principale ?
Angines, scarlatine, complications auto-immunes
Toxines — exemples?
Spe A, TSST-1, exfoliatine, PVL.
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