Coloured transmission electron micrograph of a rubella virus (red at centre), the causative agent of German measles. It consists of a lipoprotein coat and a core containing the RNA material; it is about 60 nanometres in diameter. Rubella belongs to the togavirus group of viruses. German measles is spread in airborne droplets, and occurs most commonly in children as a mild rash. Rubella is a risk to unborn babies if the mother contracts the disease during the first four months of pregnancy. A rubella vaccine is now routinely given to young babies, which provides a lasting immunity. Magnification unknown.
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