A mysterious illness at a Del Rio detention center that has killed two inmates and hospitalized two others within the past month has baffled health authorities, who have asked the Centers for Disease Control and Prevention for help. All four men — three of them foreign nationals from Honduras and Mexico held on immigration charges, the fourth a Val Verde county prisoner who was one of the dead — were described as in their 20s and 30s, and apparently healthy when they arrived at the Val Verde Correctional Facility and County Jail. The privately operated 850-bed medium-security facility is under...