People who hate vaccines but love to travel internationally have pushed U.S. measles cases to the highest level in 20 years. The Centers for Disease Control and Prevention reported Thursday there are 288 cases so far this year, the largest number since 1994. “The current increase in measles cases is being driven by unvaccinated people, primarily U.S. residents, who got measles in other countries, brought the virus back to the United States and spread to others in communities where many people are not vaccinated,” said Dr. Anne Schuchat, director of the National Center for Immunizations and Respiratory Diseases.