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Panton-Valentine leucocidin toxin
📖 About
- 🦠 Panton-Valentine Leucocidin (PVL) = pore-forming toxin produced by Staphylococcus aureus.
- 💥 Destroys white blood cells → extensive tissue necrosis.
- 🔗 Found in <2% of S. aureus isolates, affecting both MSSA & MRSA strains.
⚠️ Risks
- 🏘️ Overcrowding, institutions, poor hand hygiene.
- 🩹 Damaged skin (eczema, wounds).
- 🪒 Sharing personal items (razors, towels, gym equipment).
- 💉 IV drug use.
🩺 Clinical Features
- 😐 Asymptomatic carriage possible.
- 🩹 Skin & soft tissue infection: boils (furuncles), carbuncles, abscesses.
- 🫁 Necrotizing pneumonia: rapidly progressive, often in young/immunocompetent patients.
- Red flag signs → haemoptysis, dyspnoea, hypotension, respiratory failure.
- High mortality despite therapy.
- 📉 Can cause leucopenia + very high CRP.
🔎 Investigations
- 🧫 Microscopy: Gram-positive cocci in clusters.
- 🧪 Culture & sensitivity → confirms MSSA vs MRSA, guides antibiotics.
- 🩸 FBC → leucopenia (toxin-mediated).
- 📈 CRP markedly raised.
- 🩻 CXR → cavitating infiltrates in necrotizing pneumonia.
💊 Management
- 🏥 Admit to ITU/HDU with isolation if pneumonitis present.
- 💉 Drain abscesses; send pus/blood for culture.
- 💊 Antibiotics (tailored with microbiology input):
- First-line → Flucloxacillin (if MSSA).
- Alternatives → Erythromycin, Clindamycin, Linezolid (esp. if MRSA suspected).
- 🧑🔬 Always involve microbiology early for PVL suspicion.
💡 Exam tip: Think PVL if you see young, previously healthy patient with rapidly progressive pneumonia + haemoptysis. Key differentiator: leucopenia with very high CRP.
| The content on this website is provided for educational and informational purposes only to support exam preparation (e.g., MLA, MRCP, USMLE) and learning. This is NOT medical advice, diagnosis, treatment, or professional guidance. It does not replace consultation with a qualified healthcare professional, official guidelines (e.g., NICE, GMC, BNF), or supervised clinical practice. Always verify information with current, authoritative sources. Makindo and its contributors accept no liability for any reliance on this content, including errors, omissions, or any resulting harm, loss, or consequences. By using this site, you agree to these terms. |
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