The measles outbreak is growing across the country, and Americans should expect to see more cases for some time, Vanderbilt University School of Medicine's Dr. William Schaffner told CNBC Thursday.
"Measles is so highly contagious and there are sufficient unvaccinated children, we are going to see more for a while," Schaffner, chairman of preventative medicine at the university, said in an interview with "Power Lunch."
The measles outbreak started at Disneyland and has grown to 95 cases across 14 states, with 84 of those cases occurring Jan. 1 to Jan. 28, according to the Centers for Disease Control. This year's number is already more than the median number for most years since 2000.
The CDC said 67 of the total cases are linked to the Disney park.