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Rash: infectious mononucleosis
Infectious mononucleosis is caused by EBV (90%) and CMV. The source is oropharyngeal secretion. Virus infects B lymphocytes in pharyngeal lym-phoid tissue and then spreads to the rest of the lymphoid system.
• Prodrome: flu-like illness (headache, low-grade fever, and chills) for 3–5 days. The incubation period is 4–6wks.
• Features: exudative pharyngitis; generalized, tender lymphadenopathy; hepatosplenomegaly; widespread erythematous macular rash, especially if inadvertently treated with ampicillin; lethargy.
• Classic triad: lymphocytosis (80–90% of WBC); 10% atypical lymphocytes on peripheral blood film; positive serology for EBV.
• Monospot test: a low-sensitivity test with false positives occurring in lymphoma and hepatitis.
• Other. IgM and IgG are raised early in the disease; raised liver function tests; mild thrombocytopenia. Quantitative PCR in immunosuppressed (not for routine diagnosis).
• Symptoms: supportive care
• Splenomegaly: patients with splenomegaly should avoid contact sports for 1mth, and adolescents should avoid alcohol.
• GI and abdominal: hepatitis, splenomegaly, and splenic rupture.
• CNS: aseptic meningitis, encephalitis, Guillain–Barré syndrome.
• Post viral tiredness: is self-limiting, but may take months to resolve.
Other. lymphoma, orchitis, myocarditis, pneumonia.
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