Nelson Textbook of Pediatrics 22nd Edition | Varicella (chickenpox): fever, pruritic vesicular rash (crops, centripetal). Herpes zoster (shingles): dermatomal vesicular rash. Complications: secondary bacterial infection (Group A Strep, S. aureus), pneumonia, encephalitis, cerebellar ataxia, congenital varicella syndrome, perinatal varicella. Treatment: acyclovir (IV for severe, high-risk), valacyclovir. Prevention: varicella vaccine (2 doses), VZIG for post-exposure prophylaxis in high-risk.
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