caused by a morbillivirus; do not confuse entry term RUBEOLA with RUBELLA (German measles); French for measles = rougeole (not rubéole which = RUBELLA), Ital for measles = rosolia (not rubeola which = RUBELLA); Span for measles = sarampi (not rubeola which = RUBELLA)

A highly contagious infectious disease caused by MORBILLIVIRUS, common among children but also seen in the nonimmune of any age, in which the virus enters the respiratory tract via droplet nuclei and multiplies in the epithelial cells, spreading throughout the MONONUCLEAR PHAGOCYTE SYSTEM.