Measles (also known as morbilli, English measles, or rubeola - not to be confused with rubella) is an infection of the respiratory system caused by a virus, specifically a paramyxovirus of the genus Morbillivirus. Morbilliviruses, like other paramyxoviruses, are enveloped, single-stranded, negative-sense RNA viruses. Symptoms include fever, cough, runny nose, red eyes and a generalized, maculopapular, erythematous skin rash, the symptom for which measles is best known. Measles is spread through respiration (contact with fluids from an infected persons nose and mouth, either directly or...