Herpes and Pregnancy
Genital Herpes and Pregnancy Concerns
Overview
Genital herpes is a common viral infection caused primarily by herpes simplex virus type 2 (HSV-2) and sometimes by HSV-1. In pregnancy, genital herpes raises specific concerns because of the risk of transmitting the virus to the newborn (neonatal herpes), which can cause severe illness. With awareness, careful management, and clear communication between patient and provider, risks can be minimized.
Key risks and why they matter
Primary infection during pregnancy (first-time HSV infection) carries the highest risk of neonatal transmission, especially if it occurs in the third trimester. The mother’s immune system has not yet produced protective antibodies to pass to the fetus.
Recurrent herpes (reactivation) carries a much lower neonatal risk because maternal antibodies typically reduce viral shedding and protect the newborn.
Neonatal herpes can present as localized skin/eye/mouth disease, disseminated infection affecting multiple organs, or central nervous system disease. Disseminated and CNS disease are associated with high morbidity and mortality and long-term neurological consequences.
Screening and diagnosis
Routine universal HSV screening of asymptomatic pregnant people is not recommended. Screening is considered when there are symptoms, a partner with genital herpes, or a history that raises concern.
If lesions are present, viral culture or PCR from lesion swabs confirms diagnosis. Type-specific serologic (antibody) testing can determine prior exposure (HSV-1 vs HSV-2) when history is unclear.
Timing and interpretation of tests matter: recent exposures may not show antibodies immediately; false reassurance can occur if testing is done too early.
Management during pregnancy
Antiviral therapy: Acyclovir or valacyclovir are commonly used antivirals considered safe in pregnancy when prescribed by a clinician. Suppressive therapy starting at 36 weeks (or earlier if recurrent outbreaks are frequent) reduces the likelihood of viral shedding and the need for cesarean delivery.
Treatment for a primary episode typically includes antiviral drugs as soon as possible; providers may recommend longer courses.
Delivery planning: Mode of delivery depends on clinical findings near labor.
No active lesions and no prodrome at onset of labor: Vaginal delivery is usually acceptable.
Active genital lesions or prodromal symptoms at the time of labor: Cesarean delivery is generally recommended to reduce neonatal exposure.
Hospital precautions: If maternal infection is suspected or confirmed in labor, neonatology should be alerted, and careful examination and follow-up of the newborn are required.
Prevention and counseling
Partners: Pregnant people with partners who have known genital herpes should discuss risks and strategies (avoid sexual contact during partner’s outbreaks; consider barrier methods; partner antiviral suppression if advised by clinicians).
Avoid genital contact during the third trimester with known primary infection in the partner unless protective measures are in place and discussed with an obstetric provider.
Education about recognizing prodromal symptoms (tingling, pain) and lesions empowers timely care-seeking.
Emotional support: Diagnosis can cause anxiety and stigma. Counseling and education reduce fear and support informed decision-making.
Newborn evaluation and treatment
Newborns exposed to active maternal lesions or born to mothers with primary infection in late pregnancy require close monitoring. If infection is suspected, diagnostic testing (PCR, viral cultures) and prompt antiviral therapy (intravenous acyclovir) are essential.
Early treatment improves outcomes. Follow-up for developmental monitoring is important after neonatal herpes.
When to call a clinician
Any genital lesions or unusual genital symptoms during pregnancy.
Known exposure to a partner with genital herpes, especially if the exposure was recent or in the third trimester.
Signs of labor when lesions or prodromal symptoms are present.
Practical takeaways
Discuss HSV history with your prenatal provider; bring up any partner concerns or past cold sores/genital lesions.
If you have recurrent genital herpes, ask about suppressive antiviral therapy starting at 36 weeks to lower delivery risk.
Report lesions or prodrome during pregnancy and at labor onset — this affects delivery planning.
Newborns with possible exposure need prompt evaluation; early treatment can be lifesaving.
Resources and further steps
Ask your obstetric provider for type-specific testing if your history is unclear.
Request a care plan outlining antiviral use, delivery decisions, and neonatal precautions.
Seek emotional support or counseling if diagnosis causes distress — understanding and support improve outcomes.
One of One Voice note
This information in this blogs is educational and not a substitute for medical advice. Talk with your obstetric provider for individualized recommendations tailored to your health and pregnancy.
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