Three asylum seekers have tested positive for coronavirus in a sprawling encampment steps from the U.S. border in Matamoros, Mexico, marking the first cases in a settlement that advocates have long viewed as vulnerable amid the pandemic. Global Response Management (GRM), a nonprofit providing medical services in the camp, said it is proactively testing and isolating all close contacts of the three migrants who tested positive. "We have 5 patients in isolation: 2 who are awaiting results of testing and 3 who have tested positive on antibody testing," GRM Executive Director Helen Perry told Reuters on Tuesday.