A man wears a surgical mask, used by some migrants to protect against getting or spreading the infections rampant in their close living quarters, inside a sports complex sheltering more than 5,000 Central Americans, in Tijuana, Mexico, Wednesday, Nov. 28, 2018. As Mexico wrestles with what to do with the thousands of people camped out in the border city of Tijuana, President-elect Andres Manuel Lopez Obrador's government signaled Tuesday that it would be willing to house the migrants on Mexican soil while they apply for asylum in the United States, a key demand of U.S. President Donald Trump. (AP Photo/Rebecca Blackwell)