Chickenpox (Varicella)
during Pregnancy
A protocol for prevention, post-exposure prophylaxis, and active infection — for mother and baby.
Initial Assessment & Prevention
Determine Immunity
At the first antenatal visit, take a detailed history of prior chickenpox or shingles infection, or varicella vaccination.
If Non-Immune
- Advise avoidance of contact with anyone with chickenpox or shingles.
- Offer vaccination postnatally — not during pregnancy.
- Delay conception 1 month after vaccination.
Management Following Exposure
Determine "Significant Exposure"
- Contact type: face-to-face, or same small room for 15+ minutes, with someone who has chickenpox, disseminated shingles, or exposed shingles lesions.
- Infectious window: 24 hours before rash appears → 5 days after.
Determine Susceptibility
Urgent VZV IgG blood test for a susceptible woman with significant exposure.
A reliable history of chickenpox, or two vaccine doses, is itself sufficient evidence of immunity in an immunocompetent woman — no further testing needed.
Post-Exposure Prophylaxis (PEP)
Offered if VZV IgG negative (non-immune).
Oral Antiviral Therapy
Aciclovir or valaciclovir — now the recommended first choice. Given Day 7 to Day 14 after exposure.
VZIG
Considered if antivirals are contraindicated (e.g. renal impairment) or not tolerated. A blood product giving passive immunity; effective up to 10 days after contact.
Management of Active Chickenpox
Immediate Action
Contact the healthcare provider immediately, and isolate from other pregnant women.
Risk Profile
Maternal risks also include hepatitis and encephalitis. Fetal risk depends on gestational age at infection.
Treatment
| Route | When indicated |
|---|---|
| Oral aciclovir | Presenting within 24 hours of rash onset, ≥20 weeks gestation. Use before 20 weeks should also be considered. |
| IV aciclovir | All pregnant women with severe chickenpox or signs of complications (e.g. respiratory symptoms). |
High-Risk Window: Late Pregnancy
Maternal infection from 5 days before to 2 days after delivery carries a high risk of neonatal death. Requires specialist management in a unit with neonatology expertise.

