TEXT: HOPKINS, MN - APRIL, 27: Abdullahi Mohamud, 5, stands by the sliding glass door in his family's apartment in Hopkins, Minn., Thursday April 27, 2017. Though two of his siblings contracted the measles during the current outbreak in Minneapolis and are now recovering at home, he received one dose of the vaccine in January and did not get sick. The children must wait until May 7, when the incubation period is over, to return to school. (Photo by Courtney Perry/For the Washington Post)