More than 60 people from 16 states have been reported to have measles in the first four months of 2018, says the Centers for Disease Control and Prevention (CDC). New outbreaks continue to add to the number of cases. In 2017, the CDC says 118 people were confirmed with the highly contagious viral disease. "Measles is amongst the most infectious agents we know," says Dr. Pritish Tosh, an infectious diseases specialist at Mayo Clinic.