Causes of measles
Both the rubella as well as the rubeola viruses usually enters the body through one’s respiratory route. This means that both viruses tend to be contagious through sneezing as well as coughing. In fact, there are very few viruses that are as contagious as rubeola. Hence this virus can spread quickly in a population that is susceptible to rubeola. One who is infected retains the virus within one’s respiratory tract before one gets sick so that it might spread measles without being in any way conscious of it.