This is a tutorial based lecture based on Virus Measles. Measles, also known as rubeola, is a viral infection of the respiratory system. Measles is a very contagious disease that can spread through contact with infected mucus and saliva. The coughing or sneezing of an infected person can release the virus into the air. Measles is a leading cause of death in children. Of the 139,300 global deaths related to measles in 2010, the World Health Organization (WHO) reports that most of the victims were under the age of 5 (WHO).