Rubella is often mild—until it crosses the placenta
Also called German measles or three-day measles, rubella is a vaccine-preventable viral infection that half of those infected may not notice. A pale rash can start about two weeks after exposure and fade in three days. Early pregnancy infection can mean miscarriage or congenital rubella syndrome.
Symptoms may include itchy facial rash spreading outward, swollen lymph nodes lasting weeks, fever, sore throat, fatigue, and—especially in adults—joint pain. Complications can involve bleeding, testicular swelling, encephalitis, or nerve inflammation. CRS brings eye problems such as cataracts, deafness, and heart and brain damage; major organ risks peak in the first trimester, and problems are rare after week twenty. Sources report that 80–90% of mothers infected in that critical first trimester have miscarriage or stillbirth if the pregnancy is lost that way; survivors may show patent ductus arteriosus, blindness, deafness, "blueberry muffin" skin lesions, or neurodevelopmental disorders including autism. About 100,000 CRS cases occur yearly worldwide. Only humans host the virus; insects do not spread it. People are infectious the week before and after the rash; babies with CRS may shed more than a year. Recovery usually confers immunity.
Spread is airborne via coughs. Diagnosis uses virus in blood, throat, or urine, or antibody testing—though rubella-specific IgM can linger over a year and needs careful reading. A single vaccine dose is more than 95% effective and is often given as MMR. WHO suggests a first dose at 12–18 months and a second at 36 months. Partial coverage under 80% can leave more women reaching childbearing age without immunity, potentially raising CRS rates. There is no specific antiviral treatment; care is supportive, with surgery for some congenital heart defects and cataracts. Susceptible pregnant women are generally vaccinated only after birth because the vaccine is live. Passive immunoglobulin may help if given by the fifth day after exposure.
German physicians described the illness; George de Maton argued in 1814 it was distinct from measles and scarlet fever, and Henry Veale coined "rubella" ("little red") in 1866. Formal recognition came at London’s 1881 International Congress of Medicine. Before the 1969 vaccine, U.S. outbreaks every 6–9 years and European ones every 3–5 years hit school-age children. The 1962–65 U.S. epidemic was estimated to cause 30,000 stillbirths and 20,000 CRS-impaired births. The Americas were declared free of rubella transmission by WHO in April 2015, with no endemic case since February 2009; Cuba and the United States eliminated it earlier, and Australia was declared free in October 2018. Vaccination still matters because importation can restart chains. Pregnancy complication rates remain higher in Africa and Southeast Asia (about 121 per 100,000 live births) than in the Americas and Europe (about 2 per 100,000).
Source: Rubella
