## Most Common Complication of Measles in Children **Key Point:** Acute otitis media (AOM) is the single most common bacterial complication of measles, occurring in 7–9% of cases, particularly in children aged 2–5 years. ### Pathophysiology Measles virus causes direct mucosal damage to the respiratory tract and Eustachian tube epithelium, impairing drainage and ciliary clearance. This creates a favorable environment for secondary bacterial invasion, most commonly by *Streptococcus pneumoniae*, *Haemophilus influenzae*, and *Group A Streptococcus*. ### Clinical Presentation - Occurs during the exanthem phase or shortly after - Presents with ear pain, discharge, or perforation - May be masked by the systemic illness - Often requires antibiotic therapy ### Why AOM is Most Common | Complication | Frequency | Age Group | Timing | |---|---|---|---| | Acute otitis media | 7–9% | 2–5 years | During/after rash | | Secondary pneumonia | 1–6% | All ages | Week 1–2 | | Diarrhea | 8% | <5 years | During illness | | Encephalitis | 0.1% | All ages | Rare | | SSPE | 4–11 per 100,000 | Infected <2 yrs | Years later | **High-Yield:** In resource-limited settings like rural India, secondary bacterial infections (especially AOM and pneumonia) are far more common than viral complications like encephalitis or SSPE. **Clinical Pearl:** Always examine the ears in a child with measles; AOM may be overlooked if focus is on the rash. Prophylactic antibiotics are NOT recommended, but treatment of confirmed AOM is essential. ### Why Other Options Are Wrong - **Subacute sclerosing panencephalitis (SSPE):** A rare, fatal degenerative CNS disease occurring 7–10 years after infection (0.4–11 per 100,000 cases); far less common than AOM - **Measles encephalitis:** Occurs in ~0.1% of cases; much rarer than bacterial complications - **Measles myocarditis:** Extremely rare; not a recognized common complication [cite:Park 26e Ch 32]
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