Congenital Rubella Syndrome – Causes, Symptoms & Prevention
Congenital Rubella Syndrome (CRS) is a serious condition caused by rubella virus infection during pregnancy. It can lead to heart defects, deafness, and visual impairments in the newborn.
Things worth knowing about "Congenital Rubella Syndrome"
Congenital Rubella Syndrome (CRS) is a serious condition caused by rubella virus infection during pregnancy. It can lead to heart defects, deafness, and visual impairments in the newborn.
What is Congenital Rubella Syndrome?
Congenital Rubella Syndrome (CRS), also known as rubella embryopathy, refers to a range of severe birth defects and organ damage in newborns caused by rubella virus infection in the mother during pregnancy. The risk is highest during the first trimester (up to 16 weeks of gestation), when the organs of the developing baby are being formed and are most vulnerable to viral damage.
Causes
CRS is caused by the transplacental transmission of the rubella virus from an infected mother to her unborn child. The virus crosses the placenta and enters the fetal bloodstream, directly damaging developing cells and organ systems.
- Lack of or incomplete maternal immunity against rubella
- Primary rubella infection during pregnancy
- Infection in the first trimester (risk of damage up to 90% in the first month)
Symptoms and Birth Defects
The clinical picture of CRS varies depending on the timing of maternal infection. The classic triad described by Gregg includes:
- Heart defects: e.g., patent ductus arteriosus, pulmonary artery stenosis, ventricular septal defect
- Eye abnormalities: e.g., cataracts, glaucoma, microphthalmia
- Sensorineural hearing loss up to complete deafness
Additional manifestations may include:
- Microcephaly and intellectual disability
- Hepatosplenomegaly (enlargement of the liver and spleen)
- Thrombocytopenia (low platelet count) with petechial bleeding
- Intrauterine growth restriction
- Meningoencephalitis
- Type 1 diabetes mellitus (as a late complication)
Diagnosis
Diagnosis of CRS is made at several levels:
Prenatal Diagnosis
- Serological confirmation of active rubella infection in the mother (IgM antibodies, avidity testing)
- Amniocentesis or chorionic villus sampling for rubella RNA detection by PCR
- Ultrasound examination to identify structural abnormalities
Postnatal Diagnosis
- Detection of rubella-specific IgM antibodies in the newborn
- Viral detection (PCR) from throat swabs, urine, or cerebrospinal fluid
- Echocardiography, ophthalmological examination, hearing testing (ABR/BERA)
Treatment
There is no specific antiviral therapy for rubella virus infection. Treatment of CRS is therefore symptomatic and supportive:
- Cardiac surgery for correction of heart defects
- Surgical intervention for cataracts or glaucoma
- Hearing aids or cochlear implants for hearing impairment
- Early intervention programs and special education support for neurological impairments
- Regular multidisciplinary follow-up care (cardiology, ophthalmology, ENT, neuropediatrics)
Prevention
The most effective measure to prevent CRS is vaccination against rubella. The MMR vaccine (measles, mumps, rubella) is routinely recommended for children, typically given in two doses. Women of childbearing age should verify their vaccination status before becoming pregnant. Adequate immunization virtually eliminates the risk of CRS.
References
- World Health Organization (WHO): Rubella and Congenital Rubella Syndrome. WHO, 2023. www.who.int
- Centers for Disease Control and Prevention (CDC): Congenital Rubella Syndrome. www.cdc.gov (accessed 2024)
- Reef S.E. et al. – The changing epidemiology of rubella in the 1990s. JAMA, 2002; 287(4): 464-472.
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