535420
Description
Flashcards by gina_evans0312, updated more than 1 year ago
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Created by gina_evans0312
almost 12 years ago
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| Question | Answer |
| Growth on Blood Agar plate | Varies Depending on strain |
| Beta Haemolytic Strep. Characteristics | Complete haemolysis- celar area around colony |
| Alpha Haemolytic Strep | Partial Haemolysis- greenish tinge around colony |
| Gamma Strep | No haemolysis |
| Lancefield Classification of Strep | Based of cell wall polypeptides (identified using Ab's) |
| Lancefield Classifications | A-H & K-U (The corresponding Ag's cause agglutination |
| Mild S. Pyogenes Ingections | Impetigo |
| Serious S.Pyogenes Infections | Cellulitis, Necratising Fasciitis |
| Eipdemiology- Source | Usually exogenous (or unknown) |
| Eipdemiology- Mode of Transmission | Contact/Resp. droplets |
| Eipdemiology- Host Immunity | M-Protein Antigen confers some protection |
| Eipdemiology- Adhesion Factors | Surface F. Proteins, Lipoteichoic Acid |
| Eipdemiology- Immune Evasion (M-Protein) | Binds to host proteins, destabilising compliment and deactivating neutrophils |
| Eipdemiology- Immune Evasion (Variance) | M-Protein structure is varied in to help evade the immune system |
| Eipdemiology- Immune Evasion (Capsule) | Provides low immunogenicity |
| Eipdemiology- Immune Evasion (Streptokinase) | Facilitates spread of bacteria |
| Eipdemiology- Exotoxins | SPE A, B & C (A&C are superantigens) with all be pyogenic |
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