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    Pregnancy and herpes

    HSV; Congenital herpes; Herpes - congenital; Birth-acquired herpes; Herpes during pregnancy

    Birth-acquired herpes is a herpes virus infection that an infant gets (acquires) from the mother during pregnancy or birth.


    Newborn infants can become infected with herpes virus:

    • In the uterus (congenital herpes -- this is unusual)
    • Passing through the birth canal (birth-acquired herpes, the most common method of infection)
    • Right after birth (postpartum) from kissing or having other contact with someone who has herpes mouth sores

    If the mother has an active genital herpes infection at the time of delivery, the baby is more likely to become infected during birth. Some mothers may not be aware they have internal (inside the vagina) herpes sores.

    Some people have had herpes infections in the past, but were not aware of it. These people, not knowing that they have herpes, may pass it to their baby.

    Herpes type 2 (genital herpes) is the most common cause of herpes infection in newborn babies, but herpes type 1 (oral herpes) can also occur.


    Herpes may only appear as a skin infection. Small, fluid-filled blisters (vesicles) may appear. These blisters rupture, crust over, and finally heal, often leaving a mild scar.

    Herpes infection may also spread throughout the body (called disseminated herpes). In this type, the herpes virus can affect many different parts of the body.

    • Herpes infection in the brain is called herpes encephalitis
    • The liver, lungs, and kidneys may also be involved
    • There may or may not be blisters on the skin

    Newborn infants with herpes that has spread to the brain or other parts of the body are often very sick. Symptoms include:

    • Bleeding easily
    • Breathing difficulties
      • Blue appearance (cyanosis)
      • Flaring of the nostrils
      • Grunting
      • Rapid breathing (tachypnea)
      • Short periods without breathing (apneic episodes)
    • Coma
    • Jaundice
    • Lethargy
    • Low body temperature (hypothermia)
    • Poor feeding
    • Seizures
    • Shock
    • Skin lesions, fluid-filled blisters

    Herpes that is caught in the period shortly after birth has symptoms similar to those of birth-acquired herpes.

    Intrauterine herpes can cause:

    • Eye disease, such as inflammation of the retina (chorioretinitis)
    • Severe brain damage
    • Skin sores (lesions)

    Exams and Tests

    Tests for birth-acquired herpes include:

    • DFA test for herpes (scraping from vesicle)
    • EEG
    • MRI of the head
    • Spinal fluid culture
    • Vesicle culture

    Additional tests that may be done if the baby is very sick include:

    • Blood gas analysis
    • Coagulation studies (PT, PTT)
    • Complete blood count
    • Electrolyte measurements
    • Tests of liver function


    Herpes virus infections in infants are generally treated with medicine given through a vein (intravenous). Acyclovir is the most common antiviral medicine used for this purpose. The baby may need to take the medicine for several weeks.

    Other therapy is often needed to treat the effects of herpes infection, such as shock or seizures. Often, because these babies are very ill, treatment is done in an intensive care unit.

    Outlook (Prognosis)

    Infants with systemic herpes or encephalitis often do poorly, despite antiviral medications and early treatment.

    In infants with skin disease, the vesicles may come back repeatedly even after treatment is finished. These recurrences put them at risk for learning disabilities, and may need to be treated.

    Possible Complications

    • Bacterial or fungal infection of skin lesions
    • Coma
    • Death
    • Developmental delay
    • Excessive bleeding, disseminated intravascular coagulation (DIC)
    • Eye problems (chorioretinitis, keratitis)
    • Gastrointestinal problems, including diarrhea
    • Hepatitis
    • Jaundice
    • Liver failure
    • Lung problems including pneumonia or pneumonitis
    • Brain and nervous system (neurological) problems
    • Respiratory distress
    • Seizure
    • Shock
    • Skin lesions

    When to Contact a Medical Professional

    If your baby has any symptoms of birth-acquired herpes, including skin lesions alone, have the baby seen by your health care provider promptly.


    It is important for you to tell your doctor or nurse if youhave ahistory of genital herpes. If you have frequent herpes outbreaks, you will be given a medicine called acyclovir to take during the last month of pregnancy. This helps prevent anoutbreak around the time of delivery.C-section is recommended for pregnant women who have a new herpes sore and are in labor.

    Safer sexual practices can help prevent the mother from getting genital herpes. Mothers who are not infected with herpes cannot pass the herpes virus to the baby during delivery.

    People with "cold sores" (herpes labialis) should avoid contact with newborn infants. Caregivers who have a cold sore should wear a surgical mask and wash their hands carefully before coming into contact with the infant to prevent transmitting the virus.

    Mothers should speak to their health care providers about the best way to minimize the risk of transmitting herpes to their infant.


    Red Book: 2009 Report on The Committee on Infectious Diseases, American Academy of Pediatrics.

    Cernik C, Gallina K, Brodell RT. The treatment of herpes simplex infections: An evidence-based review. Arch Intern Med. 2008;168(11):1137-1144.

    Hollier LM, Wendel GD. Third trimester antiviral prophylaxis for preventing maternal genital herpes simplex virus (HSV) recurrences and neonatal infection. Cochrane Database Syst Rev. 2008;23(1):CD004946.


    • Congenital herpes


      • Congenital herpes


      A Closer Look

        Self Care

          Tests for Pregnancy and herpes

            Review Date: 8/23/2012

            Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Susan Storck, MD, FACOG, Chief, Eastside Department of Obstetrics and Gynecology, Group Health Cooperative of Puget Sound, Bellevue, Washington; Clinical Teaching Faculty, Department of Obstetrics and Gynecology, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.

            The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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