Inf: Cat Scratch Disease: Free MSRA Podcast

⚕️ FREE MSRA PODCAST – Cat Scratch Disease🎧 A clear, high-yield breakdown of this bacterial zoonotic infection from cats – perfect for exam prep and real-life clinical scenarios.🧠 Key Learning Points📌 Definition• Cat Scratch Disease (CSD) is a bacterial infection caused by Bartonella henselae, usually after a scratch, bite, or lick from a cat, especially kittens.📌 Causes & Risk Factors• Caused by Bartonella henselae• Main reservoir: kittens and stray cats• Transmitted via scratches, bites, or saliva on broken skin• Fleas play a role in transmission between cats• Risk factors:Frequent contact with kittensImmunocompromised individuals (e.g. HIV/AIDS, on immunosuppressants)💡 Mnemonic: “Kitten Scratch Starts Disease”📌 Pathophysiology• Bacteria enter through skin → travel via lymphatics to regional lymph nodes• Causes inflammatory lymphadenopathy• In severe cases, can spread haematogenously → systemic complications📌 Symptoms• Initial lesion at scratch site (papule/pustule in 3–12 days)• Regional lymphadenopathy (1–3 weeks later) – axillary, cervical, inguinal• Systemic symptoms: fatigue, fever, headache, anorexia• Severe/atypical presentations (esp. immunocompromised):Neuroretinitis, Parinaud's oculoglandular syndrome, bacillary angiomatosis, hepatosplenic involvement💡 Mnemonic: “Cat BITE” – Bump, Inflammation, Tender nodes, Extrasystemic signs📌 Differential Diagnosis• Viral: EBV (glandular fever), CMV• Bacterial: TB, syphilis, brucellosis, tularemia, Yersinia (plague)• Fungal: Histoplasmosis, sporotrichosis• Other: Sarcoidosis, lymphoma, toxoplasmosis, atypical mycobacteria, collagen vascular disease💡 Take a thorough cat and travel history to narrow differentials📌 Diagnosis• Clinical diagnosis supported by:Serology: IgG titres >1:64PCR for Bartonella DNAFBC/ESR: mild leukocytosis, raised ESR• Imaging (USS/MRI/CT): only if complications suspected• Lymph node biopsy: if diagnosis unclear or lymphoma suspected• CSF analysis: if neurological symptoms present📌 Management• Typical cases: often self-limiting, supportive care (analgesia, antipyretics)• Severe/atypical cases: may require antibiotics (e.g. azithromycin – per external guidelines)• Notes focus on recognising the disease spectrum and tailoring management accordingly💡 Recognise when to escalate based on severity or immune status📌 Complications• Suppurative lymphadenitis or abscesses• Neuroretinitis, encephalopathy• Hepatosplenic involvement, osteomyelitis, thrombocytopenia, erythema nodosum📌 Prognosis• Excellent in most healthy individuals• Lymph nodes may remain enlarged for weeks/months• Severe outcomes more likely in immunocompromised patients📎 More MSRA Resources for Cat Scratch Disease📝 Revision Notes: https://www.passthemsra.com/topic/cat-scratch-disease-revision-notes/🧠 Flashcards: https://www.passthemsra.com/topic/cat-scratch-disease-flashcards/💬 Accordion Q&A Notes: https://www.passthemsra.com/topic/cat-scratch-disease-accordion-qa-notes/🚀 Rapid Quiz: https://www.passthemsra.com/topic/cat-scratch-disease-rapid-quiz/🎓 Full Course: https://www.passthemsra.com/courses/infectious-diseases-for-the-msra/Hashtags#MSRA #MSRARevision #MSRATextbook #MSRAQuiz #MSRAQuestionBank #MSRAFlashcards #MSRAQ&ANotes #MSRAAccordions #MultiSpecialityRecruitmentAssessment #MSRAOnlineRevision #MSRARevisionWebsite #CatScratchDisease #InfectiousDiseases