Congenital Varicella Syndrome
What is Congenital Varicella Syndrome?
Congenital varicella syndrome is a rare condition that affects babies whose mothers had chickenpox during the first 20 weeks of pregnancy. The varicella zoster virus, which causes chickenpox, can cross the placenta and infect the developing baby. This infection can lead to serious birth defects and health problems.
The syndrome occurs in only about 2% of pregnancies when a mother has chickenpox before 20 weeks. The risk is highest between weeks 13 and 20 of pregnancy. After 20 weeks, the risk of birth defects drops significantly. Most women who had chickenpox as children or received the varicella vaccine have immunity and cannot pass the infection to their baby.
This condition is different from newborn chickenpox, which happens when a mother gets chickenpox right before delivery. Congenital varicella syndrome specifically refers to birth defects caused by infection during early pregnancy. The effects can range from mild skin scarring to severe problems with limbs, eyes, and brain development.
Symptoms
- Scarring of the skin, often following a pattern along nerve pathways
- Underdeveloped or shortened limbs, arms, or legs
- Eye problems including cataracts, small eyes, or vision loss
- Brain and spinal cord abnormalities
- Intellectual disabilities or developmental delays
- Muscle weakness or paralysis
- Low birth weight and poor growth before birth
- Seizures or neurological problems
- Gastrointestinal issues or digestive problems
- Problems with bladder and bowel control
Symptoms are typically present at birth and identified during newborn examinations. Some effects may not become apparent until the child grows older. The severity varies widely from child to child.
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Causes and risk factors
Congenital varicella syndrome is caused by the varicella zoster virus infecting a developing baby during the first 20 weeks of pregnancy. The virus crosses the placenta from an infected mother who has active chickenpox. Women who have never had chickenpox and have not been vaccinated are at highest risk. The virus affects developing tissues during critical periods of organ formation.
Risk factors include lack of immunity to varicella before pregnancy, exposure to someone with active chickenpox during early pregnancy, and living in areas with low vaccination rates. Women who work with children or in healthcare settings may have higher exposure risk. The varicella vaccine has dramatically reduced cases since its introduction in 1995. Planning for immunity before pregnancy is the best prevention strategy.
How it's diagnosed
Diagnosis begins with prenatal testing when a pregnant woman has chickenpox during the first 20 weeks. Doctors use ultrasound imaging to look for signs of birth defects in the developing baby. Amniocentesis, a procedure that tests fluid around the baby, can detect the virus. Blood tests can check for varicella zoster virus antibodies to confirm whether a woman has immunity before or during pregnancy.
After birth, doctors diagnose the syndrome based on physical examination findings and the mother's history of chickenpox during pregnancy. Imaging tests like MRI or CT scans help evaluate brain and organ development. Specialized testing for this condition requires consultation with maternal-fetal medicine specialists and pediatric experts. Talk to a healthcare provider about appropriate testing and monitoring during pregnancy.
Treatment options
- Prenatal monitoring with frequent ultrasounds to track fetal development
- Varicella-zoster immune globulin for pregnant women exposed to chickenpox
- Physical therapy to improve muscle strength and mobility
- Occupational therapy to develop daily living skills
- Surgery to correct limb abnormalities or eye problems when possible
- Medications to manage seizures if neurological problems occur
- Special education services and developmental support
- Assistive devices like braces or wheelchairs as needed
- Regular follow-up with pediatric specialists throughout childhood
- Vision and hearing support services when required
Frequently asked questions
Congenital varicella syndrome is very rare, affecting only about 2% of pregnancies when the mother has chickenpox before 20 weeks. The risk is highest between weeks 13 and 20 of pregnancy. Since the introduction of the varicella vaccine in 1995, cases have decreased significantly. Most pregnant women have immunity from prior infection or vaccination.
Yes, prevention is possible through vaccination before pregnancy. Women who have never had chickenpox should get the varicella vaccine at least one month before trying to conceive. The vaccine cannot be given during pregnancy. Checking immunity status before pregnancy allows time for vaccination if needed.
Contact your healthcare provider immediately if you are exposed to chickenpox during pregnancy and are not immune. You may receive varicella-zoster immune globulin within 10 days of exposure to prevent or reduce severity of infection. Your doctor will monitor you closely and may order additional testing. Avoiding contact with people who have active chickenpox is important.
A blood test for varicella zoster virus IgG antibodies can confirm immunity before or during pregnancy. Most people born in the United States before 1980 had chickenpox as children and have natural immunity. People who received two doses of the varicella vaccine are also considered immune. Your doctor can check your immunity during preconception planning.
Yes, chickenpox can be more severe in pregnant women than in the general population. Pregnant women are at higher risk for pneumonia and other serious complications from the infection. The virus can also affect the developing baby, particularly during the first 20 weeks of pregnancy. Getting vaccinated before pregnancy protects both mother and baby.
Congenital varicella syndrome occurs when a mother has chickenpox during the first 20 weeks of pregnancy, causing birth defects in the baby. Neonatal varicella happens when a mother gets chickenpox within five days before or two days after delivery, causing the newborn to develop chickenpox. Both are serious but involve different timing and outcomes.
Outcomes vary widely depending on the severity of the condition. Some children have mild effects and develop relatively normally with appropriate support and therapy. Others may have significant disabilities requiring ongoing medical care and assistance. Early intervention with physical therapy, special education, and medical treatment can improve quality of life.
Yes, checking your varicella immunity is part of good preconception planning. If you are not immune, you can receive the vaccine before pregnancy to protect yourself and your future baby. The test is a simple blood draw that checks for IgG antibodies. Most obstetricians recommend immunity testing as part of pre-pregnancy health evaluation.
No, fathers cannot directly pass varicella to the developing baby. The virus crosses the placenta only from the mother to the baby. However, a father with active chickenpox can infect the pregnant mother if she is not immune. Family members should avoid exposing pregnant women to chickenpox or shingles.
A team of specialists typically provides care for affected babies. This may include pediatricians, neurologists, orthopedic surgeons, ophthalmologists, and developmental specialists. Physical therapists, occupational therapists, and speech therapists often provide ongoing treatment. Coordinated care among multiple providers helps address the various challenges these children may face.