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Chickenpox around delivery: balancing maternal and neonatal risk

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The timing of delivery becomes particularly important when maternal chickenpox develops near term.

Delivery during active maternal viraemia may worsen maternal risk through haemorrhage or coagulopathy and can expose the newborn before sufficient protective maternal antibody has crossed the placenta.

If maternal and fetal condition permit, delivery should ideally be delayed until at least 7 days after onset of the maternal rash. This allows maternal recovery and time for passive antibody transfer.

The neonatal concern is greatest when birth occurs within 7 days of maternal rash onset or when the mother develops chickenpox up to 7 days after delivery. Babies in the 7-days-before to 7-days-after maternal-rash window require neonatal prophylaxis as soon as possible with VZIG with or without aciclovir.

Maternal deterioration can override the preferred delay; for example, delivery may be required to facilitate ventilation in respiratory failure.

Management therefore balances maternal condition, obstetric indication, passive antibody transfer and neonatal prophylaxis rather than applying a fixed rule to every near-term infection.

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Chickenpox around delivery: balancing maternal and neonatal risk

Additional Insight #85

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