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Risk of fetal varicella syndrome if maternal chickenpox:

  • risk of the syndrome in children exposed to chickenpox in utero is around 0.5% if maternal chickenpox develops at 2-12 weeks of pregnancy
  • 1.4% if it develops at 12-28 weeks
  • 0% if it develops from 28 weeks onwards
  • overall risk in the first 20 weeks of pregnancy is 0.91%


  1. Drug and Therapeutics Bulletin 2005; 43(12): 94-95.