Inf: DNA Viruses: Free MSRA Podcast

🧬 FREE MSRA PODCAST – DNA Viruses: Family Guide, Key Infections & Exam NuggetsSmash your MSRA revision with this concise, high-yield breakdown of DNA viruses—structures, families, classic clinical presentations, and key memory tricks.🧠 Key Learning Points📌 What Are DNA Viruses?• Viruses with DNA as genetic material (most are double-stranded—except parvovirus B19, which is single-stranded!).• Infect a range of human tissues—skin, liver, nerves, respiratory tract.• Divided into major families based on structure and clinical features.📌 Core Families & Memory AidsMnemonic: HAPPHIP• Herpesviruses: dsDNA, linear, enveloped (e.g. HSV, VZV, CMV, EBV – think cold sores, chickenpox, mono).• Hepadnavirus: dsDNA, circular, enveloped (HBV).• Adenovirus: dsDNA, linear, naked (conjunctivitis, pharyngitis).• Poxvirus: dsDNA, linear, enveloped (smallpox, molluscum).• Parvovirus: ssDNA, linear, naked (the exception—slapped cheek, B19).• Papillomavirus: dsDNA, circular, naked (HPV—warts, cervical cancer).• Polyomavirus: dsDNA, circular, naked (JC virus, PML in immunocompromised).Enveloped = fragile outside body, spread by close contact/fluidsNaked = tougher, can spread via surfaces/fomites📌 Transmission & Risk Factors• Skin/respiratory: Herpes, adenovirus• Sexual: HPV, HSV, HBV• Blood/needles: HBV• Immunosuppressed: JC virus, CMV reactivation• Lack of vaccination increases risk (e.g., HBV, HPV)📌 Pathophysiology & Latency• Many DNA viruses establish latency—lie dormant, reactivate later (herpes, HBV, VZV, CMV, JC virus)• Latency explains recurrences (e.g., cold sores, shingles, PML)• Naked vs enveloped predicts environmental survival and infection control📌 Clinical Features• Herpes: painful ulcers (oral/genital), encephalitis• VZV: chickenpox (vesicles), shingles• Adenovirus: pharyngitis, conjunctivitis, pneumonia• Parvovirus: slapped cheek, arthropathy, anaemia• HPV: warts, cervical/anal/oropharyngeal cancers• HBV: hepatitis, cirrhosis, HCC• JC virus: progressive multifocal leukoencephalopathy (PML)• Poxvirus: molluscum (pearly papules), smallpox (eradicated)📌 Diagnosis• PCR = gold standard (detects viral DNA in swabs, blood, CSF, tissue)• Serology (IgM/IgG) = recent/past infection• Antigen tests, viral culture, histology (e.g., molluscum bodies)📌 Management• Supportive for many mild infections• Antivirals: – Acyclovir/famciclovir for HSV/VZV – Tenofovir/entecavir for chronic HBV• Vaccines: – HPV, HBV, VZV (in UK schedule)• Prevention: – Hand hygiene (naked viruses tough) – Safe sex, vaccination, avoid sharing needles📌 Complications• Chronic infection (e.g., HBV, herpes)• Latency/reactivation (herpes, VZV, CMV, JC)• Cancer (HPV, HBV, EBV)• Severe disease in immunocompromised (PML, disseminated VZV/CMV)• Secondary bacterial infection (e.g., superimposed on HSV lesions)📎 More DNA Virus MSRA Resources:📝 Revision Notes: https://www.passthemsra.com/topic/dna-viruses-revision-notes/🧠 Flashcards: https://www.passthemsra.com/topic/dna-viruses-flashcards/💬 Accordion Q&A: https://www.passthemsra.com/topic/dna-viruses-accordion-qa-notes/🚀 Rapid Quiz: https://www.passthemsra.com/topic/dna-viruses-rapid-quiz/🔗 Quiz: https://www.passthemsra.com/quizzes/dna-viruses/🎓 Infectious Diseases for the MSRA: https://www.passthemsra.com/courses/infectious-diseases-for-the-msra/#MSRA #DNAViruses #Herpes #HPV #HepatitisB #Adenovirus #VZV #Poxvirus #Parvovirus #JCvirus #MedicalVirology #ExamPrep #PassTheMSRA #RevisionPodcast