Measles cases in the United States hit a 15-year high in 2011, with 90 percent of the cases traced to other countries with lower immunization rates the centr for diseas control and prevention.There were 222 cases of measles in the United States last year, more than triple the usual number the CDC said. There had been only about 60 cases per year between 2001 and 2010.No one has died of the disease in the United States since 2008. But approximately 20 million people contract the measles viruseach year worldwide, and about 164,000 die from it  said Dr. Anne Schuchat director of the health agencys National Center for Immunization and respiratory diseases. The agency said in 2000 that home grown measles had been eliminated, but cases continued to arrive in the United States from abroad.More than 90 percent of U.S children have been vaccinated against measles the CDC said.