Measles is caused by a paramyxovirus and travels primarily in fine droplets released by coughing or sneezing. It can only be carried by humans and not through other animals. The virus can grow in cells throughout the body. However, it likes the mucous lining of the respiratory tract the best.
About two weeks after exposure, a rash appears with a high fever.
People who recover from this disease are immune to it. There is a vaccine for it. Children should get vaccinated at 15 months, younger if they are in underdeveloped countries. Booster shots should be taken later.
The shots are now part of what is called MMR shots which is a shot for measles, mumps, and rubella.