Congenital Rubella Syndrome

Congenital Rubella Syndrome is a group of serious birth defects that occur when a mother contracts rubella during pregnancy. Rubella, also called German measles, is a viral infection that causes mild illness in most adults. When a pregnant woman gets rubella, the virus crosses the placenta and infects the developing baby.

The syndrome can cause heart defects, vision and hearing loss, developmental delays, and organ damage. The risk is highest when infection happens during the first trimester, particularly in the first 12 weeks of pregnancy. About 90% of babies will develop defects when mothers are infected in the first 11 weeks.

Congenital Rubella Syndrome is now rare in countries with strong vaccination programs. The MMR vaccine, which protects against measles, mumps, and rubella, has dramatically reduced cases. Before the vaccine was available in 1969, rubella epidemics caused thousands of babies to be born with the syndrome.

Babies born with Congenital Rubella Syndrome may have a wide range of health problems. Some symptoms appear at birth, while others develop over months or years.

• Low birth weight and slow growth after birth
• Hearing loss or complete deafness
• Clouding of the cornea or cataracts affecting vision
• Heart defects, especially in the valves and arteries
• Microcephaly, meaning an abnormally small head and brain
• Developmental delays and intellectual disability
• Enlarged liver and spleen at birth
• Purple skin spots caused by bleeding under the skin
• Eye problems including glaucoma and retinal damage
• Bone disease that weakens developing bones

Not every baby develops all symptoms. Severity depends on when during pregnancy the mother was infected. Earlier infections typically cause more severe and widespread problems.

Congenital Rubella Syndrome happens when a pregnant woman without immunity contracts the rubella virus. The virus spreads through respiratory droplets when infected people cough or sneeze. Once the virus enters the mother's bloodstream, it crosses the placenta and infects fetal tissue during critical stages of organ development.

The main risk factor is lack of immunity to rubella before pregnancy. Women who were never vaccinated or never had rubella infection have no antibodies to fight the virus. Risk increases with exposure to infected individuals, travel to areas with lower vaccination rates, and living in communities with low immunization coverage. The timing of infection matters greatly, with first trimester infections causing the most severe outcomes. Women planning pregnancy should confirm their immunity status through blood testing before conception.

Diagnosis begins with maternal immunity testing before or during early pregnancy. A blood test measures Rubella Ab IgG antibodies to determine if a woman has protection against rubella. If antibodies are absent or low, the woman lacks immunity and faces risk if exposed during pregnancy. When a pregnant woman develops symptoms of rubella or has known exposure, additional testing checks for recent infection using IgM antibodies.

For babies, doctors diagnose Congenital Rubella Syndrome through physical examination, hearing and vision tests, heart imaging, and viral testing from throat swabs or urine. Specialized testing for this condition requires coordination with maternal-fetal medicine specialists and pediatric experts. Talk to your doctor about testing for rubella immunity, especially if you are planning pregnancy or in your first trimester.

There is no cure for Congenital Rubella Syndrome. Treatment focuses on managing individual symptoms and supporting development.

• Heart surgery to repair structural defects in infants
• Hearing aids or cochlear implants for hearing loss
• Cataract removal surgery and corrective lenses for vision problems
• Early intervention programs including speech and physical therapy
• Special education services for developmental and learning needs
• Regular monitoring by cardiologists, audiologists, and ophthalmologists
• Medications to manage complications like glaucoma or seizures

Prevention is the most effective strategy. Women should verify their rubella immunity before pregnancy through blood testing. Those without immunity should receive the MMR vaccine at least one month before trying to conceive. The vaccine cannot be given during pregnancy because it contains live virus. Pregnant women without immunity should avoid exposure to rubella and can be vaccinated immediately after delivery to protect future pregnancies.