How does someone become infected with measles, mumps and rubella?
These infections are caused by viruses that are spread through contact with another person or sometimes by airborne route (sneeze or cough). How effective is the MMR vaccine? When both doses of the MMR vaccine are given, the immunized person is 99.7 percent protected from measles and rubella, and about 85 percent from mumps. Since the measles vaccine was licensed, there has been a 100 percent reduction in measles cases in the United States. All cases now are imported from other countries by unimmunized or under-immunized people. As of September of 2008 there were outbreaks of measles in 17 states (137 cases in children too young to have been vaccinated and children and adults not vaccinated). With the introduction of the mumps vaccine, the number of mumps cases has fallen from approximately 200,000 cases per year to 600 cases annually. However, in 2006 outbreaks of mumps in adolescents and young adults were reported from several states. Before a vaccine was developed for rubella, there
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