People who oppose immigration often argue that migrants bring disease with them, and that they then become a burden to health systems in their new countries because they’re so sick. But that's not true, a team of experts argued in a new report released Wednesday. In fact, they point out that immigrants make up a significant portion of the healthcare work forces in their new homelands. 

"There is no evidence to show that migrants are spreading disease," said Dr. Paul Spiegel, who directs the Center for Humanitarian Health at Johns Hopkins School of Public Health. "That is a false argument that is used to keep migrants out," Spiegel told NBC News.