Inf: Listeria Monocytogenes: Free MSRA Podcast

⚕️ FREE MSRA PODCAST – Listeria (Listeriosis)🎯 In today’s Deep Dive, we break down everything you need to know about Listeriosis — the foodborne infection you must know for the MSRA.From pathophysiology to management, all distilled into high-yield revision pearls! 💡🧠 Key Learning Points📌 Definition• Caused by Listeria monocytogenes, a Gram-positive intracellular bacterium 🦠• Acquired through ingestion of contaminated food• Can cross the placenta → danger to foetus💡 Memory Hook: “Listeria = Lethal in Low Immunity”📌 Transmission & Risk Factors• Contaminated food: unpasteurised dairy, soft cheeses (brie, camembert), deli meats, pâtés, cold salads 🧀🥩🥗• Environmental: soil, water, livestock• High-Risk Groups:Pregnant women 🤰Neonates 👶Elderly 👵Immunocompromised (HIV, cancer, chemotherapy, steroids) 🚫🛡️• Occupational exposure: vets, farmers → cutaneous listeriosis💡 Mnemonic: “PINE” – Pregnancy, Immunocompromised, Neonates, Elderly📌 Pathophysiology• Invades gut cells → enters bloodstream → survives intracellularly inside macrophages• Disseminates to CNS, placenta, liver, spleen💡 Memory Hook: “Ingest → Invade → Hide inside → Spread”📌 Clinical Features• Pregnant women: mild flu-like illness 🤒 → severe neonatal outcomes (miscarriage, stillbirth, sepsis, meningoencephalitis) 🚨• Immunocompromised/Elderly: meningitis, septicemia, pneumonia, endocarditis, focal organ infections• Infants: poor feeding, lethargy, jaundice, vomiting, seizures, respiratory distress• Cutaneous form: papular/pustular lesions (farmers/vets) 🖐️📌 Differential Diagnoses• Salmonella, Campylobacter, other causes of bacterial gastroenteritis• Sepsis, meningitis from other pathogens• CNS infections (Herpes, TB, viral)📌 Investigations• Blood cultures (gold standard for systemic infection) 🩸• CSF analysis (for meningitis) via lumbar puncture 💉• PCR: rapid detection 🔬• CXR: if pneumonia suspected• TOE: if endocarditis suspected• MRI > CT: for CNS imaging 🧠💡 Mnemonic: “Source dictates the test”📌 Management• First-line antibiotics:Ampicillin + Gentamicin 💊Pregnancy: Amoxicillin alone (avoid gentamicin) 🚫Penicillin allergy: Erythromycin• Duration: 21 days (for invasive disease) ⏳• Supportive care: fluids, antipyretics, monitoring• Avoid cephalosporins — ineffective against Listeria ❌📌 Complications• Meningitis, encephalitis, septicemia, endocarditis• Pregnancy: miscarriage, stillbirth, neonatal death• Neonatal: long-term neurodevelopmental delay📌 Prevention• Food safety is key 🧼• High-risk groups should avoid:Unpasteurised soft cheesesDeli meats, pâtésSmoked seafood, pre-prepared salads• Pregnant women: avoid animal contact (lambing season)💡 Memory Hook: “Avoid Cold Deli Dairy”📌 Epidemiology (UK)• Rare but serious• 142 cases (England & Wales, 2019)• Human carriage rate: up to 10%📎 More MSRA Resources for Listeria📝 Revision Notes:https://www.passthemsra.com/topic/listeria-revision-notes/🧠 Flashcards:https://www.passthemsra.com/topic/listeria-flashcards/💬 Accordion Q&A Notes:https://www.passthemsra.com/topic/listeria-accordion-qa-notes/🚀 Rapid Quiz:https://www.passthemsra.com/topic/listeria-rapid-quiz/🧪 Extra Quiz:https://www.passthemsra.com/quizzes/listeria/🎓 Full Course:https://www.passthemsra.com/courses/infectious-diseases-for-the-msra/#MSRA #MSRARevisionNotes #MSRATextbook #MSRAQuiz #MSRAQuestionBank #MSRAFlashcards #MSRAQANotes #MSRAAccordions #MultiSpecialityRecruitmentAssessment #MSRAOnlineRevision #MSRARevisionWebsite #InfectiousDiseases #Listeria