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Chickenpox in Infants After Shingles Exposure: Early Signs

A 6-month-old exposed to shingles can develop chickenpox (varicella) since they lack immunity.

Incubation

10–21 days (average 14–16) after exposure.

Early Signs (Prodrome, 1–2 Days Before Rash)

  • Low-grade fever (100–102°F)
  • Fussiness, decreased appetite, fatigue
  • Mild respiratory symptoms (coryza, cough)

Rash Evolution

  1. Macules → papules → vesicles (dew drop on rose petal) → pustules → crusts.
  2. Centrifugal: starts trunk/face/scalp → spreads to extremities.
  3. Crops appear over 3–5 days → lesions in all stages simultaneously.
  4. Intensely pruritic.

    5. Complications in Infants

    • Bacterial superinfection (impetigo, cellulitis).
    • Pneumonia, encephalitis, cerebellar ataxia.
    • Higher risk if <1 year, immunocompromised, or maternal varicella near delivery.

    Action

    • Call pediatrician immediately—may recommend varicella-zoster immune globulin (VariZIG) if high-risk exposure.
    • Antivirals (acyclovir) if started <24h after rash onset.
    • Supportive: hydration, acetaminophen (NO aspirin—Reye’s), antipruritics.

    Vaccination at 12–15 months prevents disease.

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