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Rubella (or German measles) is caused by a different virus from the one that causes regular measles (rubeola). It causes a rash that usually lasts about three days, and may be accompanied by a low grade fever. Immunity to rubella does not protect a person from measles, or vice versa. If rubella is contracted during early pregnancy, there can be a high rate of fetal wastage or birth defects, known as Congenital Rubella Syndrome (CRS).