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MSRA Deep Dive: Infectious Mononucleosis (Glandular Fever)
In this revision-focused episode, we break down infectious mononucleosis, commonly called mono or the kissing disease. Caused by Epstein-Barr virus (EBV), this condition affects adolescents and young adults and is a frequent MSRA topic. We summarise the key features, from classic symptoms to rare complications β all based on the latest revision notes.
π§ Key Learning Points
π Definition
Infectious mononucleosis is a viral illness caused by EBV, most common in 15β24-year-olds, and characterised by fever, sore throat, lymphadenopathy, and profound fatigue.
π Transmission
β’ Saliva β kissing, sharing drinks
β’ Also: blood transfusion, sexual contact, respiratory droplets
π Pathophysiology
EBV infects B lymphocytes, triggering an intense immune response via cytotoxic T cells. The symptoms result largely from this immune battle β not just the virus itself.
π Risk Factors
β’ Close contact (e.g., kissing)
β’ Teenagers and young adults
β’ Weakened immunity
β’ Most people are infected during childhood (often asymptomatic)
π Epidemiology
β’ Worldwide distribution
β’ Asymptomatic in children, but symptomatic in teens
β’ Common in developed countries
π Symptoms
β’ Triad: Fever, pharyngitis, cervical lymphadenopathy
β’ Fatigue, malaise
β’ Tonsillar enlargement Β± white patches
β’ Hepatosplenomegaly, rash, headache, jaundice
β’ Severe: airway obstruction
π Signs
β’ Palatal petechiae, maculopapular rash
β’ Periorbital oedema
β’ Bruising, mild jaundice
β’ Splenomegaly β critical for management
π Differential Diagnoses
β’ Strep pharyngitis, tonsillitis
β’ CMV (mononucleosis-like syndrome)
β’ Other viral URTIs
β’ HIV (in prolonged cases)
π Investigations
β’ Monospot (heterophile antibody test) β typically positive in teens/adults
β’ EBV serology β IgM = acute; IgG = past infection
β’ FBC β raised lymphocytes Β± atypical lymphocytes
β’ LFTs β may show mild hepatitis
β’ Imaging (US/CT) only if splenic rupture suspected
π Management
π― Supportive care
β’ Rest, hydration, paracetamol
β’ Avoid contact sports for at least 4β8 weeks to reduce splenic rupture risk
β οΈ No antibiotics unless bacterial co-infection
β’ Steroids only in airway compromise
β’ Rare: IVIG in severe thrombocytopenia with bleeding
π Prognosis
β’ Self-limiting in most cases
β’ Fatigue may persist for weeksβmonths
β’ Most recover fully with rest and time
π Complications
β’ Splenic rupture β especially in young men
β’ Airway obstruction
β’ Hepatitis, jaundice, myocarditis
β’ Neurological: Guillain-BarrΓ©, meningitis, encephalitis
β’ Malignancies: Hodgkin lymphoma, Burkittβs lymphoma, nasopharyngeal carcinoma
β’ Interstitial nephritis, rare CNS complications
π Infectious Mononucleosis MSRA Resources
π Revision Notes: https://www.passthemsra.com/topic/infectious-mononucleosis-revision-notes/
π¬ Flashcards: https://www.passthemsra.com/topic/infectious-mononucleosis-flashcards/
π§ Accordion Q&A Notes: https://www.passthemsra.com/topic/infectious-mononucleosis-accordion-qa-notes/
π Rapid Quiz: https://www.passthemsra.com/topic/infectious-mononucleosis-rapid-quiz/
π― Quiz Portal: https://www.passthemsra.com/quizzes/infectious-mononucleosis/
π ENT MSRA Course: https://www.passthemsra.com/courses/ent-for-the-msra/
π·οΈ Hashtags
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