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Bact; Strep
DD
| Question | Answer |
|---|---|
| Lancefield groups of medical importance | A, B, and D |
| Group based on | Lancefield |
| Type based on | M protein |
| fun of M protein | antigenic determinant but also antigenic |
| Streptolysin O | Antigenic responsible for damage to cardiac and Red blood cells |
| Streptolysin S | O2 stable not antigenic |
| Capsule? | hyaluronic acid capsule non-immunogenic |
| Pyrogenic Exotoxin | Spe A, B, C |
| What Exotoxin causes Scarlet fever? | Spe A |
| What exotoxin causes TSLS | Spe A |
| What Ag causes necrotizing fascilitis | Spe B |
| what M protein is associated with TSLS | M1 |
| what M proteins are associated with Acute Rheumatic Fever | 2, 4, 12 |
| what is Strep sensitive to | Bacitracin |
| how can you diagnose strep | Catalase neg, bacitracin sensitive, rapid agglutination, B hemolytic, ASO (abs to streptolysin O) |
| what does M protein do? | antiphagocytic it binds fibrinogen (host) and protein H to stop complement |
| Random assistant exotoxins | Hyaluronidase, DNAase, Anti C5 peptidase |
| how long do symptoms of Strep pharyngitis last | 7 days |
| how long are strep pharyngitis kids contagious | 1-4 weeks |
| how does necrotizing fasciitis enter | trauma |
| mortality from necrotizing faciitis Hospital gangrene | 60% |
| how does scarlet fever present | starts on trunk and spreads to extremities |
| how does TSS and TSLS differ | with TSLS pts are bacteremic |
| what percent dev. chorea with Rheumatic fever | 6% |
| Acute migratory polyarthritis | in 75% no permanent damage |
| when does Post strep GN show up | 10 days after skin or pharyngiitis |
| What effect can TSLS have on the lungs | ARDS |
| mortality of TSLS | 30% |
| Treat Strep | penicillin V or erythromycin, Penicillin G for serious infections |